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Publisher: John Wiley and Sons   (Total: 1582 journals)

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Showing 1 - 200 of 1583 Journals sorted alphabetically
Abacus     Hybrid Journal   (Followers: 11, SJR: 0.48, h-index: 22)
About Campus     Hybrid Journal   (Followers: 5)
Academic Emergency Medicine     Hybrid Journal   (Followers: 53, SJR: 1.385, h-index: 91)
Accounting & Finance     Hybrid Journal   (Followers: 43, SJR: 0.547, h-index: 30)
ACEP NOW     Free  
Acta Anaesthesiologica Scandinavica     Hybrid Journal   (Followers: 50, SJR: 1.02, h-index: 88)
Acta Archaeologica     Hybrid Journal   (Followers: 134, SJR: 0.101, h-index: 9)
Acta Geologica Sinica (English Edition)     Hybrid Journal   (Followers: 3, SJR: 0.552, h-index: 41)
Acta Neurologica Scandinavica     Hybrid Journal   (Followers: 5, SJR: 1.203, h-index: 74)
Acta Obstetricia et Gynecologica Scandinavica     Hybrid Journal   (Followers: 15, SJR: 1.197, h-index: 81)
Acta Ophthalmologica     Hybrid Journal   (Followers: 5, SJR: 0.112, h-index: 1)
Acta Paediatrica     Hybrid Journal   (Followers: 54, SJR: 0.794, h-index: 88)
Acta Physiologica     Hybrid Journal   (Followers: 7, SJR: 1.69, h-index: 88)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Acta Psychiatrica Scandinavica     Hybrid Journal   (Followers: 35, SJR: 2.518, h-index: 113)
Acta Zoologica     Hybrid Journal   (Followers: 5, SJR: 0.459, h-index: 29)
Acute Medicine & Surgery     Hybrid Journal   (Followers: 2)
Addiction     Hybrid Journal   (Followers: 32, SJR: 2.086, h-index: 143)
Addiction Biology     Hybrid Journal   (Followers: 12, SJR: 2.091, h-index: 57)
Adultspan J.     Hybrid Journal   (SJR: 0.127, h-index: 4)
Advanced Energy Materials     Hybrid Journal   (Followers: 24, SJR: 6.411, h-index: 86)
Advanced Engineering Materials     Hybrid Journal   (Followers: 24, SJR: 0.81, h-index: 81)
Advanced Functional Materials     Hybrid Journal   (Followers: 47, SJR: 5.21, h-index: 203)
Advanced Healthcare Materials     Hybrid Journal   (Followers: 13, SJR: 0.232, h-index: 7)
Advanced Materials     Hybrid Journal   (Followers: 247, SJR: 9.021, h-index: 345)
Advanced Materials Interfaces     Hybrid Journal   (Followers: 6, SJR: 1.177, h-index: 10)
Advanced Optical Materials     Hybrid Journal   (Followers: 4, SJR: 2.488, h-index: 21)
Advanced Science     Open Access   (Followers: 4)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17, SJR: 2.729, h-index: 121)
Advances in Polymer Technology     Hybrid Journal   (Followers: 13, SJR: 0.344, h-index: 31)
Africa Confidential     Hybrid Journal   (Followers: 19)
Africa Research Bulletin: Economic, Financial and Technical Series     Hybrid Journal   (Followers: 12)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
African Development Review     Hybrid Journal   (Followers: 33, SJR: 0.275, h-index: 17)
African J. of Ecology     Hybrid Journal   (Followers: 14, SJR: 0.477, h-index: 39)
Aggressive Behavior     Hybrid Journal   (Followers: 15, SJR: 1.391, h-index: 66)
Aging Cell     Open Access   (Followers: 9, SJR: 4.374, h-index: 95)
Agribusiness : an Intl. J.     Hybrid Journal   (Followers: 6, SJR: 0.627, h-index: 14)
Agricultural and Forest Entomology     Hybrid Journal   (Followers: 14, SJR: 0.925, h-index: 43)
Agricultural Economics     Hybrid Journal   (Followers: 44, SJR: 1.099, h-index: 51)
AIChE J.     Hybrid Journal   (Followers: 28, SJR: 1.122, h-index: 120)
Alcoholism and Drug Abuse Weekly     Hybrid Journal   (Followers: 7)
Alcoholism Clinical and Experimental Research     Hybrid Journal   (Followers: 7, SJR: 1.416, h-index: 125)
Alimentary Pharmacology & Therapeutics     Hybrid Journal   (Followers: 33, SJR: 2.833, h-index: 138)
Alimentary Pharmacology & Therapeutics Symposium Series     Hybrid Journal   (Followers: 3)
Allergy     Hybrid Journal   (Followers: 49, SJR: 3.048, h-index: 129)
Alternatives to the High Cost of Litigation     Hybrid Journal   (Followers: 3)
American Anthropologist     Hybrid Journal   (Followers: 130, SJR: 0.951, h-index: 61)
American Business Law J.     Hybrid Journal   (Followers: 24, SJR: 0.205, h-index: 17)
American Ethnologist     Hybrid Journal   (Followers: 89, SJR: 2.325, h-index: 51)
American J. of Economics and Sociology     Hybrid Journal   (Followers: 28, SJR: 0.211, h-index: 26)
American J. of Hematology     Hybrid Journal   (Followers: 30, SJR: 1.761, h-index: 77)
American J. of Human Biology     Hybrid Journal   (Followers: 12, SJR: 1.018, h-index: 58)
American J. of Industrial Medicine     Hybrid Journal   (Followers: 16, SJR: 0.993, h-index: 85)
American J. of Medical Genetics Part A     Hybrid Journal   (Followers: 15, SJR: 1.115, h-index: 61)
American J. of Medical Genetics Part B: Neuropsychiatric Genetics     Hybrid Journal   (Followers: 3, SJR: 1.771, h-index: 107)
American J. of Medical Genetics Part C: Seminars in Medical Genetics     Partially Free   (Followers: 5, SJR: 2.315, h-index: 79)
American J. of Orthopsychiatry     Hybrid Journal   (Followers: 4, SJR: 0.756, h-index: 69)
American J. of Physical Anthropology     Hybrid Journal   (Followers: 35, SJR: 1.41, h-index: 88)
American J. of Political Science     Hybrid Journal   (Followers: 237, SJR: 5.101, h-index: 114)
American J. of Primatology     Hybrid Journal   (Followers: 14, SJR: 1.197, h-index: 63)
American J. of Reproductive Immunology     Hybrid Journal   (Followers: 3, SJR: 1.347, h-index: 75)
American J. of Transplantation     Hybrid Journal   (Followers: 15, SJR: 2.792, h-index: 140)
American J. on Addictions     Hybrid Journal   (Followers: 9, SJR: 0.843, h-index: 57)
Anaesthesia     Hybrid Journal   (Followers: 118, SJR: 1.404, h-index: 88)
Analyses of Social Issues and Public Policy     Hybrid Journal   (Followers: 11, SJR: 0.397, h-index: 18)
Analytic Philosophy     Hybrid Journal   (Followers: 15)
Anatomia, Histologia, Embryologia: J. of Veterinary Medicine Series C     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 27)
Anatomical Sciences Education     Hybrid Journal   (Followers: 1, SJR: 0.633, h-index: 24)
Andrologia     Hybrid Journal   (Followers: 2, SJR: 0.528, h-index: 45)
Andrology     Hybrid Journal   (Followers: 2, SJR: 0.979, h-index: 14)
Angewandte Chemie     Hybrid Journal   (Followers: 154)
Angewandte Chemie Intl. Edition     Hybrid Journal   (Followers: 204, SJR: 6.229, h-index: 397)
Animal Conservation     Hybrid Journal   (Followers: 34, SJR: 1.576, h-index: 62)
Animal Genetics     Hybrid Journal   (Followers: 8, SJR: 0.957, h-index: 67)
Animal Science J.     Hybrid Journal   (Followers: 5, SJR: 0.569, h-index: 24)
Annalen der Physik     Hybrid Journal   (Followers: 5, SJR: 1.46, h-index: 40)
Annals of Anthropological Practice     Partially Free   (Followers: 2, SJR: 0.187, h-index: 5)
Annals of Applied Biology     Hybrid Journal   (Followers: 8, SJR: 0.816, h-index: 56)
Annals of Clinical and Translational Neurology     Open Access   (Followers: 1)
Annals of Human Genetics     Hybrid Journal   (Followers: 9, SJR: 1.191, h-index: 67)
Annals of Neurology     Hybrid Journal   (Followers: 42, SJR: 5.584, h-index: 241)
Annals of Noninvasive Electrocardiology     Hybrid Journal   (Followers: 2, SJR: 0.531, h-index: 38)
Annals of Public and Cooperative Economics     Hybrid Journal   (Followers: 9, SJR: 0.336, h-index: 23)
Annals of the New York Academy of Sciences     Hybrid Journal   (Followers: 5, SJR: 2.389, h-index: 189)
Annual Bulletin of Historical Literature     Hybrid Journal   (Followers: 12)
Annual Review of Information Science and Technology     Hybrid Journal   (Followers: 14)
Anthropology & Education Quarterly     Hybrid Journal   (Followers: 24, SJR: 0.72, h-index: 31)
Anthropology & Humanism     Hybrid Journal   (Followers: 16, SJR: 0.137, h-index: 3)
Anthropology News     Hybrid Journal   (Followers: 14)
Anthropology of Consciousness     Hybrid Journal   (Followers: 11, SJR: 0.172, h-index: 5)
Anthropology of Work Review     Hybrid Journal   (Followers: 11, SJR: 0.256, h-index: 5)
Anthropology Today     Hybrid Journal   (Followers: 92, SJR: 0.545, h-index: 15)
Antipode     Hybrid Journal   (Followers: 45, SJR: 2.212, h-index: 69)
Anz J. of Surgery     Hybrid Journal   (Followers: 6, SJR: 0.432, h-index: 59)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apmis     Hybrid Journal   (Followers: 1, SJR: 0.855, h-index: 73)
Applied Cognitive Psychology     Hybrid Journal   (Followers: 66, SJR: 0.754, h-index: 69)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 6, SJR: 0.632, h-index: 58)
Applied Psychology     Hybrid Journal   (Followers: 130, SJR: 1.023, h-index: 64)
Applied Psychology: Health and Well-Being     Hybrid Journal   (Followers: 47, SJR: 0.868, h-index: 13)
Applied Stochastic Models in Business and Industry     Hybrid Journal   (Followers: 5, SJR: 0.613, h-index: 24)
Aquaculture Nutrition     Hybrid Journal   (Followers: 13, SJR: 1.025, h-index: 55)
Aquaculture Research     Hybrid Journal   (Followers: 31, SJR: 0.807, h-index: 60)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 34, SJR: 1.047, h-index: 57)
Arabian Archaeology and Epigraphy     Hybrid Journal   (Followers: 11, SJR: 0.453, h-index: 11)
Archaeological Prospection     Hybrid Journal   (Followers: 12, SJR: 0.922, h-index: 21)
Archaeology in Oceania     Hybrid Journal   (Followers: 13, SJR: 0.745, h-index: 18)
Archaeometry     Hybrid Journal   (Followers: 27, SJR: 0.809, h-index: 48)
Archeological Papers of The American Anthropological Association     Hybrid Journal   (Followers: 14, SJR: 0.156, h-index: 2)
Architectural Design     Hybrid Journal   (Followers: 24, SJR: 0.261, h-index: 9)
Archiv der Pharmazie     Hybrid Journal   (Followers: 4, SJR: 0.628, h-index: 43)
Archives of Drug Information     Hybrid Journal   (Followers: 4)
Archives of Insect Biochemistry and Physiology     Hybrid Journal   (SJR: 0.768, h-index: 54)
Area     Hybrid Journal   (Followers: 12, SJR: 0.938, h-index: 57)
Art History     Hybrid Journal   (Followers: 205, SJR: 0.153, h-index: 13)
Arthritis & Rheumatology     Hybrid Journal   (Followers: 48, SJR: 1.984, h-index: 20)
Arthritis Care & Research     Hybrid Journal   (Followers: 27, SJR: 2.256, h-index: 114)
Artificial Organs     Hybrid Journal   (Followers: 1, SJR: 0.872, h-index: 60)
ASHE Higher Education Reports     Hybrid Journal   (Followers: 13)
Asia & the Pacific Policy Studies     Open Access   (Followers: 15)
Asia Pacific J. of Human Resources     Hybrid Journal   (Followers: 318, SJR: 0.494, h-index: 19)
Asia Pacific Viewpoint     Hybrid Journal   (SJR: 0.616, h-index: 26)
Asia-Pacific J. of Chemical Engineering     Hybrid Journal   (Followers: 7, SJR: 0.345, h-index: 20)
Asia-pacific J. of Clinical Oncology     Hybrid Journal   (Followers: 6, SJR: 0.554, h-index: 14)
Asia-Pacific J. of Financial Studies     Hybrid Journal   (SJR: 0.241, h-index: 7)
Asia-Pacific Psychiatry     Hybrid Journal   (Followers: 3, SJR: 0.377, h-index: 7)
Asian Economic J.     Hybrid Journal   (Followers: 8, SJR: 0.234, h-index: 21)
Asian Economic Policy Review     Hybrid Journal   (Followers: 3, SJR: 0.196, h-index: 12)
Asian J. of Control     Hybrid Journal   (SJR: 0.862, h-index: 34)
Asian J. of Endoscopic Surgery     Hybrid Journal   (SJR: 0.394, h-index: 7)
Asian J. of Organic Chemistry     Hybrid Journal   (Followers: 4, SJR: 1.443, h-index: 19)
Asian J. of Social Psychology     Hybrid Journal   (Followers: 5, SJR: 0.665, h-index: 37)
Asian Politics and Policy     Hybrid Journal   (Followers: 13, SJR: 0.207, h-index: 7)
Asian Social Work and Policy Review     Hybrid Journal   (Followers: 5, SJR: 0.318, h-index: 5)
Asian-pacific Economic Literature     Hybrid Journal   (Followers: 5, SJR: 0.168, h-index: 15)
Assessment Update     Hybrid Journal   (Followers: 4)
Astronomische Nachrichten     Hybrid Journal   (Followers: 2, SJR: 0.701, h-index: 40)
Atmospheric Science Letters     Open Access   (Followers: 29, SJR: 1.332, h-index: 27)
Austral Ecology     Hybrid Journal   (Followers: 12, SJR: 1.095, h-index: 66)
Austral Entomology     Hybrid Journal   (Followers: 10, SJR: 0.524, h-index: 28)
Australasian J. of Dermatology     Hybrid Journal   (Followers: 7, SJR: 0.714, h-index: 40)
Australasian J. On Ageing     Hybrid Journal   (Followers: 7, SJR: 0.39, h-index: 22)
Australian & New Zealand J. of Statistics     Hybrid Journal   (Followers: 13, SJR: 0.275, h-index: 28)
Australian Accounting Review     Hybrid Journal   (Followers: 3, SJR: 0.709, h-index: 14)
Australian and New Zealand J. of Family Therapy (ANZJFT)     Hybrid Journal   (Followers: 3, SJR: 0.382, h-index: 12)
Australian and New Zealand J. of Obstetrics and Gynaecology     Hybrid Journal   (Followers: 42, SJR: 0.814, h-index: 49)
Australian and New Zealand J. of Public Health     Hybrid Journal   (Followers: 11, SJR: 0.82, h-index: 62)
Australian Dental J.     Hybrid Journal   (Followers: 6, SJR: 0.482, h-index: 46)
Australian Economic History Review     Hybrid Journal   (Followers: 4, SJR: 0.171, h-index: 12)
Australian Economic Papers     Hybrid Journal   (Followers: 21, SJR: 0.23, h-index: 9)
Australian Economic Review     Hybrid Journal   (Followers: 6, SJR: 0.357, h-index: 21)
Australian Endodontic J.     Hybrid Journal   (Followers: 3, SJR: 0.513, h-index: 24)
Australian J. of Agricultural and Resource Economics     Hybrid Journal   (Followers: 3, SJR: 0.765, h-index: 36)
Australian J. of Grape and Wine Research     Hybrid Journal   (Followers: 5, SJR: 0.879, h-index: 56)
Australian J. of Politics & History     Hybrid Journal   (Followers: 13, SJR: 0.203, h-index: 14)
Australian J. of Psychology     Hybrid Journal   (Followers: 16, SJR: 0.384, h-index: 30)
Australian J. of Public Administration     Hybrid Journal   (Followers: 384, SJR: 0.418, h-index: 29)
Australian J. of Rural Health     Hybrid Journal   (Followers: 4, SJR: 0.43, h-index: 34)
Australian Occupational Therapy J.     Hybrid Journal   (Followers: 64, SJR: 0.59, h-index: 29)
Australian Psychologist     Hybrid Journal   (Followers: 11, SJR: 0.331, h-index: 31)
Australian Veterinary J.     Hybrid Journal   (Followers: 19, SJR: 0.459, h-index: 45)
Autism Research     Hybrid Journal   (Followers: 31, SJR: 2.126, h-index: 39)
Autonomic & Autacoid Pharmacology     Hybrid Journal   (SJR: 0.371, h-index: 29)
Banks in Insurance Report     Hybrid Journal   (Followers: 1)
Basic & Clinical Pharmacology & Toxicology     Hybrid Journal   (Followers: 9, SJR: 0.539, h-index: 70)
Basic and Applied Pathology     Open Access   (Followers: 2, SJR: 0.113, h-index: 4)
Basin Research     Hybrid Journal   (Followers: 3, SJR: 1.54, h-index: 60)
Bauphysik     Hybrid Journal   (Followers: 2, SJR: 0.194, h-index: 5)
Bauregelliste A, Bauregelliste B Und Liste C     Hybrid Journal  
Bautechnik     Hybrid Journal   (Followers: 1, SJR: 0.321, h-index: 11)
Behavioral Interventions     Hybrid Journal   (Followers: 7, SJR: 0.297, h-index: 23)
Behavioral Sciences & the Law     Hybrid Journal   (Followers: 21, SJR: 0.736, h-index: 57)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 9, SJR: 0.11, h-index: 5)
Beton- und Stahlbetonbau     Hybrid Journal   (Followers: 2, SJR: 0.493, h-index: 14)
Biochemistry and Molecular Biology Education     Hybrid Journal   (Followers: 6, SJR: 0.311, h-index: 26)
Bioelectromagnetics     Hybrid Journal   (Followers: 1, SJR: 0.568, h-index: 64)
Bioengineering & Translational Medicine     Open Access  
BioEssays     Hybrid Journal   (Followers: 10, SJR: 3.104, h-index: 155)
Bioethics     Hybrid Journal   (Followers: 14, SJR: 0.686, h-index: 39)
Biofuels, Bioproducts and Biorefining     Hybrid Journal   (Followers: 1, SJR: 1.725, h-index: 56)
Biological J. of the Linnean Society     Hybrid Journal   (Followers: 14, SJR: 1.172, h-index: 90)
Biological Reviews     Hybrid Journal   (Followers: 2, SJR: 6.469, h-index: 114)
Biologie in Unserer Zeit (Biuz)     Hybrid Journal   (Followers: 44, SJR: 0.12, h-index: 1)
Biology of the Cell     Full-text available via subscription   (Followers: 9, SJR: 1.812, h-index: 69)
Biomedical Chromatography     Hybrid Journal   (Followers: 6, SJR: 0.572, h-index: 49)
Biometrical J.     Hybrid Journal   (Followers: 5, SJR: 0.784, h-index: 44)
Biometrics     Hybrid Journal   (Followers: 37, SJR: 1.906, h-index: 96)
Biopharmaceutics and Drug Disposition     Hybrid Journal   (Followers: 10, SJR: 0.715, h-index: 44)
Biopolymers     Hybrid Journal   (Followers: 18, SJR: 1.199, h-index: 104)
Biotechnology and Applied Biochemistry     Hybrid Journal   (Followers: 45, SJR: 0.415, h-index: 55)
Biotechnology and Bioengineering     Hybrid Journal   (Followers: 137, SJR: 1.633, h-index: 146)
Biotechnology J.     Hybrid Journal   (Followers: 13, SJR: 1.185, h-index: 51)
Biotechnology Progress     Hybrid Journal   (Followers: 39, SJR: 0.736, h-index: 101)
Biotropica     Hybrid Journal   (Followers: 17, SJR: 1.374, h-index: 71)
Bipolar Disorders     Hybrid Journal   (Followers: 10, SJR: 2.592, h-index: 100)
Birth     Hybrid Journal   (Followers: 33, SJR: 0.763, h-index: 64)
Birth Defects Research Part A : Clinical and Molecular Teratology     Hybrid Journal   (Followers: 2, SJR: 0.727, h-index: 77)
Birth Defects Research Part B: Developmental and Reproductive Toxicology     Hybrid Journal   (Followers: 5, SJR: 0.468, h-index: 47)
Birth Defects Research Part C : Embryo Today : Reviews     Hybrid Journal   (SJR: 1.513, h-index: 55)

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Journal Cover Applied Organometallic Chemistry
  [SJR: 0.632]   [H-I: 58]   [6 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0268-2605 - ISSN (Online) 1099-0739
   Published by John Wiley and Sons Homepage  [1582 journals]
  • Effect of pseudohalogen groups on the optical properties and the
           structures of diorganotin coordination compounds based on the flexible
           ligand 1,2,3,4-tetra-(4-pyridyl)-butane
    • Authors: Mostafa M. Amini; Ezzatollah Najafi, Hamid Saeidian, Elham Mohammadi, Shiva Mosavi Shahabi, Seik Weng Ng
      Abstract: To investigate the effect of pseudo-halogen groups on the structure and optical properties of diorganotin(IV) coordination compounds the reaction of dimethyltin diisothiocyanate and dimethyltin dichloride with 1,2,3,4-tetra- (4-pyridyl)-butane (TPB) were studied. The results of spectroscopic data and structural analyses of prepared compounds showed that the reaction of Me2SnCl2 with TPB ligand leads to the formation of a 2D organotin(IV) coordination polymer, while the replacement of chloride ions with thiocyanate ions as pseudohalogen groups in the structure of Me2SnCl2 results in the development of a salt with an anion complex and a dimeric stannoxane as a side product. The results showed that the use of pseudo-halogen groups instead of halogen groups in the structure of diorganotin(IV) dihalogen compounds could be as a suitable factor in the control of the structure of diorganotin(IV) coordination compounds. The investigation of optical properties of prepared compounds demonstrated that the use of pseudo-halogen groups in the structure of diorganotin(IV) coordination compounds have an influence on their photoluminescence behavior.The effect of pseudo-halogen groups on the structure and optical properties of diorganotin(IV) coordination were investigated. Structural analyses showed that the reaction of Me2SnCl2 with 1,2,3,4-tetra- (4-pyridyl)-butane ligand leads to the formation of a 2D organotin(IV) coordination polymer, while the replacement of chloride ions with thiocyanate ions in the structure of Me2SnCl2 results to salt formation. Optical properties studies showed that the use of pseudo-halogen groups in the structure of diorganotin(IV) coordination compounds have an influence on their photoluminescence behavior.
      PubDate: 2017-05-24T01:45:43.280794-05:
      DOI: 10.1002/aoc.3884
       
  • Synthesis of novel magnetic nanoparticles with urea or urethane moieties:
           Applications as catalysts in the Strecker synthesis of α-aminonitriles
    • Authors: Saeed Baghery; Mohammad Ali Zolfigol, Romana Schirhagl, Masoumeh Hasani, Marc C.A. Stuart, Andreas Nagl
      Abstract: Four novel magnetic nanoparticle catalysts with urea or urethane moieties are reported. The silica-coated magnetic nanoparticles were simply functionalized via addition of 3-(triethoxysilyl)propylisocyanate (TESPIC), amine or amino alcohol. TESPIC with dual labile functional groups was used as a suitable precursor for the synthesis of urethane-based catalysts. The newly synthesized catalysts were fully characterized using a variety of techniques. These functionalized magnetic nanoparticles were used as reusable catalysts in the Strecker synthesis of α-aminonitrile derivatives under solvent-free conditions at 50 °C.Four novel biological-based magnetic nanoparticle catalysts with urea or urethane moieties were synthesized via reaction of 3-(triethoxysilyl)propylisocyanate, amine or amino alcohol and silica-coated magnetic cores. Their catalytic application was also studied in the Strecker synthesis of α-aminonitrile derivatives.
      PubDate: 2017-05-24T01:45:29.471225-05:
      DOI: 10.1002/aoc.3883
       
  • A novel hydrophobic copper complex supported on γ-Fe2O3 as a magnetically
           heterogeneous catalyst for one-pot three-component synthesis of
           α-aminophosphonates
    • Authors: Sara Sobhani; Fatemeh Khakzad
      Abstract: A novel hydrophobic copper complex supported on γ-Fe2O3 is synthesized and characterized by different methods such as FT-IR, XRD, TEM, SEM, TGA, VSM, ICP and CHN analysis. It was used as a magnetically recyclable heterogeneous catalyst for the efficient synthesis of α-aminophosphonates via a one-pot three-component reaction under solvent-free conditions. The present catalytic system worked extremely well for the synthesis of α-aminophosphonates even up to five subsequent trails without significant loss of its catalytic activity or copper leaching. The TEM image and FT-IR spectrum of the catalyst after five times recovery showed that the structure of the catalyst was stable under the reaction conditions with no change being observed. The strong magnetic properties of the reused catalyst were revealed by complete and easy attraction using an external magnet and also by VSM curve. This work represents the first and unique example of a hydrophobic copper complex for catalysis in water generating reactions.A novel hydrophobic copper complex supported on γ-Fe2O3 is synthesized and characterized by different methods such as FT-IR, XRD, TEM, SEM, TGA, VSM, ICP and CHN analysis. It was used as a magnetically recyclable heterogeneous catalyst for the efficient synthesis of α-aminophosphonates via a one-pot three-component reaction under solvent-free conditions.
      PubDate: 2017-05-24T01:40:33.845015-05:
      DOI: 10.1002/aoc.3877
       
  • Characterization and thermal studies of nano-synthesized Mn(II), Co(II),
           Ni(II) and Cu(II) complexes with adipohydrazone ligand as new promising
           antimicrobial and antitumor agents
    • Authors: Mohamed Gaber; Abdalla M. Khedr, Mohsen Elsharkawy
      Abstract: New seven complexes of N1,N6-bis((2-hydroxynaphthalin-1-yl)methinyl))adipohydrazone (H2L) with MnCl2•4H2O, CoCl2•6H2O, NiCl2•6H2O, CuCl2•2H2O, Cu(NO3)2•3H2O, CuSO4•5H2O, and Cu(OAc)2•2H2O have been prepared and characterized by the aid of elemental and thermal analyses, spectra (FT-IR, 1H NMR, MS, UV-Vis, ESR, X-ray powder diffraction), molar conductance and magnetic moment measurements. The XRD results unambiguously confirmed the nano-sized particles of the complexes. The results showed that H2L behaves as dibasic tetra-dentate ligand towards the metal ions of interest. The low molar conductance values revealed the non-electrolytic nature for the chelates. The magnetic moment data, UV-Vis and ESR spectra denoted the formation of octahedral geometries for Mn(II) and Ni(II) complexes, whereas Co(II), Cu(II) complexes exhibited tetrahedral arrangement. The activation parameters for the thermal decomposition stages were calculated from TGA curves using Coats-Redfern and Horowitz–Metzger methods. The obtained data were confirmed by 3-D molecular modeling of the ligand and some complexes. The investigated compounds were screened for their antimicrobial activities against different types of organisms and antitumor activities towards human liver Carcinoma (HEPG2) cell to access their potential chemotherapeutic use. The free ligand (H2L) exhibited a weak inhibition of cell viability with IC50 of 11.80 μg/ml, complexes 4, 6 and 7 showed a moderate activity with IC50 of 5.56, 7.71 and 5.67 μg/ml, whereas complexes 1, 2, 3, and 5 displayed a strong anticancer activity with IC50 of 4.65, 3.97, 3.30 and 4.84 μg/ml, compared with IC50 value of 4.73 μg/ml for the doxorubicin (standard cytotoxin drug).In-vitro cytotoxicity of N1,N6-bis((2-hydroxynaphthalin-1-yl)methinyl))adipohydrazone (ligand) and its complexes 1–7 against human liver Carcinoma cell line (HEPG2).
      PubDate: 2017-05-23T00:00:32.306525-05:
      DOI: 10.1002/aoc.3885
       
  • Heteroscorpionate-based heteroleptic copper(II) complexes: Antioxidant,
           molecular docking and in vitro cytotoxicity studies
    • Authors: S. Jayakumar; D. Mahendiran, V. Viswanathan, D. Velmurugan, A. Kalilur Rahiman
      Abstract: Three new heteroscorpionate ligands, (2-hydroxyphenyl)bis(imidazol-1-yl)methane (HL1), (4-diethylamino-2-hydroxyphenyl)bis(imidazol-1-yl)methane (HL2) and (5-bromo-2-hydroxyphenyl)bis(imidazol-1-yl)methane (HL3), and their heteroleptic copper(II) complexes of the type [Cu(L1–3)diimine]ClO4 (1–6; where diimine =2,2′-bipyridyl or 1,10-phenanthroline) have been synthesized and characterized using spectroscopic methods. The molecular structure of ligand HL1 was determined by single-crystal X-ray diffraction. UV–visible, electron paramagnetic resonance and theoretical studies suggest a distorted square pyramidal geometry around copper(II) ion. Analyses of highest occupied and lowest unoccupied molecular orbitals have been used to explain the charge transfer taking place within the complexes. The antioxidant activities of the heteroscorpionate ligands and their heteroleptic copper(II) complexes were determined using ABTS, DPPH and H2O2 free radical scavenging assays with respect to standard antioxidant ascorbic acid. In molecular docking studies, the complexes showed π–π, hydrogen bonding, van der Waals and electrostatic interactions with fibroblast growth factor receptor kinase. In vitro cytotoxicity activities of ligands and copper(II) complexes were examined on human breast adenocarcinoma (MCF-7), cervical (HeLa) and lung (A549) cancer cell lines and normal human dermal fibroblast cell line using MTT assay. Complex 4 exhibited higher anticancer activity than the other complexes against all three cancer lines, being more potent than the standard drug cisplatin.Six heteroscorpionate-based heteroleptic copper(II) complexes have been synthesized and characterized. The antioxidant activity was performed using three different methods. In vitro cytotoxicity was performed against three cancerous and one normal cell lines by MTT assay. Molecular docking study was performed with FGFR kinase. The complex containing electron-releasing substituent (─N(C2H5)2) and extended aromaticity exhibit highest biological activity.
      PubDate: 2017-05-22T23:15:39.323831-05:
      DOI: 10.1002/aoc.3809
       
  • Ultrasonic treatment of wastewater contaminated with various dyes using
           tin oxide hydroxide nanoparticles loaded on activated carbon: Synthesis,
           performance, mechanism and statistical optimization
    • Authors: Sima Porhemmat; Alireza Rezvani, Mehrorang Ghaedi, Arash Asfaram, Alireza Goudarzi
      Abstract: Present research describe applicability of tin oxide hydroxide nanoparticles loaded on activated carbon (Sn6O4 (OH)4-NPs-AC) which recognized via by Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) for the rapid simultaneous removal of Methyl orange (MB) and methylene blue (MB) in mixture in the presence of ultrasonic wave. The central composite design (CCD) pattern as branch of response surface methodology (RSM) give useful information about influence of five most important operating variables is separate and combination nature namely pH (4.0–8.0), initial MO (8–24 mg L−1) and MB concentration (4–12 mg l−1), sonication time (2–6 min) and adsorbent mass (0.01–0.03 g) on the ultrasound under study dyes assisted adsorption. After surveying the experiment data and finding regression analysis correspond to experimental data, mathematical model and equation was constructed and derived which applied for optimizing ultrasound assisted adsorption and revel serious dependency of response to variables like adsorbent mass and sonication time s. F values of 114.5 and 165.5, coefficient of determination (R2) of 0.9978 and 0.9985, adjusted-R2 of 0.9891 and 0.9925, adequate precision (AP) of 39.11 and 40.23, coefficient of variation (CV) of 0.653 and 1.988% for MB and MO respectively, implied the satisfactory adjustment of the quadratic model. Based on CCD, the optimum conditions was set as pH of 6.0; 0.02 g adsorbent; 20 and 12 mg l−1 of MO and MB concentration and 2 min sonication time. The predicted removal of MO and MB in binary system were 98.19 and 98.02% which was good agreement with their experimental R% MO and MB value of 98.00% for both at optimum condition. The equilibrium data has good agreement with Langmuir with maximum monolayer adsorption capacity of 30.90 and 25.70 mg g−1 for MO and MB respectively. Investigation of time dependency of adsorption data revel more applicability pseudo-second order in cooperation with intraparticle diffusion description of the mechanism and adsorption rate.Sn6O4 (OH)4-NPs-AC as a novel adsorbent were used for simultaneous removal of MO and MB.Significant variables were investigated using the response surface methodology.The dyes adsorption data were best followed by Langmuir and pseudo-second order models.
      PubDate: 2017-05-19T05:58:02.323266-05:
      DOI: 10.1002/aoc.3860
       
  • Heterogeneous Jacobsen's catalyst on alkoxyl-modified zirconium poly
           (styrene-phenylvinylphosphonate)-phosphate (ZPS-PVPA) for asymmetric
           epoxidation
    • Authors: Jing Huang; Weigang Ding, Jiali Cai
      Abstract: Chiral Jacobsen's catalysts grafted onto alkoxyl-modified ZPS-PVPA exhibit excellent activities (conv%, up to 96; sele%, up to 96; ee%, up to >99) in the asymmetric epoxidations of unfunctionalized olefins. The superior stabilities and the comfortable dispositions in large-scale reactions contribute to the potential applications in industry.The immobilized Jacobsen's catalysts onto ZPS-PVPA indicate superior catalytic performance both for experimental scale and for large-scale reactions.
      PubDate: 2017-05-19T05:51:16.800963-05:
      DOI: 10.1002/aoc.3861
       
  • Issue Information
    • Abstract: No abstract is available for this article.
      PubDate: 2017-05-17T00:03:41.752926-05:
      DOI: 10.1002/aoc.3617
       
  • Synthesis, crystal structure, DNA interaction and anticancer evaluation of
           pyruvic acid derived hydrazone and its transition metal complexes
    • Authors: Divya Hegde; Suneel Dodamani, Vijay Kumbar, Sunil Jalalpure, Kalagouda B. Gudasi
      Abstract: A novel tridentate chelating ligand, Ethyl 2-(2-(2-chlorobenzoyl)hydrazono)propanoate and its late transition metal complexes were synthesized, characterized and evaluated for anticancer behavior. The structures were elucidated with the help of elemental analyses, spectral (vibrational, electronic, NMR and mass) and thermo-gravimetric techniques. Single crystal X-ray crystallographic studies of the ligand suggest an orthorhombic lattice structure with Pna21 space group. The interaction of ligand and complexes with DNA (CT-DNA) has been extensively studied using absorption, emission, viscosity and thermal denaturation studies with E. coli DNA. The DNA cleavage ability of ligand and metal complexes was tested using plasmid pBR322 DNA by gel electrophoresis method. The ligand and its copper complex have been evaluated for their in vitro anticancer activity against human cancer cells of different origin such as KB (Oral), A431 (Skin), Mia-Pa-Ca (Pancreases), K-549 (Lung), K-562 (Leukemia), MCF-7 (Breast) and VERO by MTT assay and the apoptosis assay was carried out with acridine orange/ethidium bromide (AO/EB) staining method. The studies suggest that ligand and copper complex exhibit significant cytotoxic activity on KB, MCF-7, A-431, Mia-Pa-Ca-2 an d A-549 cell lines compared to K-562 and VERO cell lines.A novel tridentate chelating ligand, Ethyl 2-(2-(2-chlorobenzoyl)hydrazono)propanoate and its late transition metal complexes were synthesized, characterized and evaluated for their DNA interaction and anticancer behavior by MTT assay and the apoptosis assay was carried out with acridine orange/ethidium bromide (AO/EB) staining method.
      PubDate: 2017-05-16T03:35:53.806502-05:
      DOI: 10.1002/aoc.3851
       
  • Intensified removal of Malachite green by AgOH-AC nanoparticles combined
           with ultrasound: Modeling and optimization
    • Authors: Ehsan Solaymani; Mehrorang Ghaedi, Hajir Karimi, Mohammad Hossein Ahmadi Azqhandi, Arash Asfaram
      Abstract: In this work Random Forest (RF) and Response surface methodology (RSM) were used to model and predict the efficiency of malachite green removal from aqueous solution by ultrasound-assisted adsorption onto the silver hydroxide nanoparticles loaded on activated carbon (AgOH-NPs-AC). The prepared nanoparticles were characterized by SEM, FTIR, XRD and TEM. The parameters such as pH, initial MG concentration, sonication time and adsorbent dosage involved in the adsorption process were set within the ranges 2.0–10, 4–20 mg L−1, 2–6 min and 0.005–0.025 g, respectively. The performance of the RF and CCD models for the description of experimental data was evaluated in terms of the coefficient of determination (R2), the root mean squared error (RMSE), mean absolute error (MAE) and absolute average deviation (AAD). The obtained results showed that the RF model outperformed in comparison to classical statistical model for modeling the process of dye adsorption. Desirability function approach (DFA) and Genetic algorithm (GA) combined central composite design (CCD) as global optimization technique were used for simultaneous optimization of effective factors. GA and DFA were revealed that 20 mg L−1 MG by 0.025 g AgOH-NPs-AC at pH = 8.0 and sonication time for 6 min with adsorption capacity 40.98 and 41.99 mg g−1 can be removed, respectively. The equilibrium adsorption data were analyzed by Langmuir Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The best fit to the data was obtained from the Langmuir model. Meanwhile, the maximum adsorption capacity for MG by 0.01, 0.02 and 0.025 g of AgOH-NPs-AC was estimated 57.143, 42.735 and 40.980 mg g−1, respectively. Analysis of experimental adsorption data to various kinetic models shows the applicability of the second-order equation model. The variable importance principle also shows that RF give maximum importance to sonication time for removal of MG.In this work, activated carbon modified with AgOH-NPs-AC was used as an efficient adsorbent for the MG removal from aqueous solution. Also, the adsorption process was optimized using RSM and RF. The variable importance principle shows that RF gives maximum importance to sonication time for removal of MG. It was seen that MG adsorption on AgOH-NPs-AC follows the pseudo second-order and Elovich models.
      PubDate: 2017-05-16T03:30:44.17801-05:0
      DOI: 10.1002/aoc.3857
       
  • DNA interaction and cleavage studies of ancillary chiral ligand and
           N,N-donor ligands coordinated platinum(II) complexes
    • Authors: Jegathalaprathaban Rajesh; Mookkandi Palsamy Kesavan, Srinivasan Ayyanaar, Kesavan Karthikeyan, Gurusamy Rajagopal, Periyakaruppan Athappan
      Abstract: Four new platinum(II) complexes [Pt(dpen)(bpy)](ClO4)2 (1), [Pt(dpen)(phen)](ClO4)2 (2), [Pt(dpen)(dpq)](ClO4)2 (3) and [Pt(dpen)(dppz)](ClO4)2 (4) comprising of different N,N-donor ligands, viz., 2,2′-bipyridine (bpy), 1,l0-phenanthroline (phen), dipyridoquinoxaline (dpq), dipyrido-[3,2-d:2¢,3¢-f–phenazine] (dppz), and chiral ancillary ligand 1R,2R-1,2-diphenylethylenediamine (dpen) have been synthesized and characterized. The interaction of these complexes 1–4 with calf-thymus DNA (CT-DNA) has been explored using absorption, circular dichroism spectral and cyclic voltammetric studies. The absorption spectrum of complex 4 with dppz ligand exhibits a major red shift with an overall hypochromic as well as a hyperchromic effect in the presence of DNA, other complexes (1–3) show only hypochromism. From these absorption spectral studies, the intercalative ability of the complexes follows the order as, 4 > 3 > 2 > 1, which is further confirmed by CD and cyclic voltammetry measurements. CD spectral studies show that DNA becomes more A-like upon interaction with the complexes 1 & 2 but the complexes 3 & 4 bring about B-form to Z- form DNA conformational transition. The DNA cleavage study of these Pt(II) complexes 1–4 carried out by gel electrophoresis revealed that complexes 1–4 can cleave super coiled (SC) pUC18 DNA efficiently into open circular form (form II) under hydrolytic and oxidative conditions.New Pt(II) complexes 1-4 are prepared and characterized using spectral techniques. Complex 4 with dppz ligand and has effective DNA binding behavior than others. Pt(II) complexes 1-4 cleaved super coiled DNA under hydrolytic as well as oxidative conditions.
      PubDate: 2017-05-16T03:26:28.157102-05:
      DOI: 10.1002/aoc.3868
       
  • A Schiff base-grafted nanoporous silica material as a reversible optical
           probe for Hg2+ ion in water
    • Authors: Jafar Afshani; Alireza Badiei, Mehdi Karimi, Negar Lashgari, Ghodsi Mohammadi Ziarani
      Abstract: A novel organic–inorganic silica-based fluorescent probe was designed, synthesized and characterized by different techniques such as XRD, BET, TGA, and FT-IR. The fluorescence properties of the probe were studied in the presence of a variety of metal-ions in water. The results revealed that various metal-ions negligibly vary the emission intensity of the probe except for Hg2+, which quenched the intensity dramatically. The selectivity of the probe toward Hg2+ ion was further investigated in the presence of common competing metal-ions and the results demonstrated the high selectivity of the probe toward Hg2+ ion. The fluorescence emission of the probe was also studied as a function of the concentration of Hg2+ ion. A nanomolar limit of detection was estimated for Hg2+, indicating a high sensitivity. Furthermore, the probe showed INHIBIT-type logic behavior with Hg2+ and H+ as inputs. Also, the optimum pH range was studied in addition to reversibility and real world applicability of the probe.A novel fluorescent probe based on functionalization of SBA-15 with a Schiff base was synthesized and displayed a high selectivity for Hg2+ over a variety of metal ions in water with a nanomolar limit of detection. Furthermore, the probe showed INHIBIT- type logic behavior with Hg2+ and H+ as inputs.
      PubDate: 2017-05-16T03:25:52.699033-05:
      DOI: 10.1002/aoc.3856
       
  • Facile synthesis of indene and fluorene derivatives through
           AlCl3-catalyzed cyclization of in situ formed iminium ions
    • Authors: Lei Chen; Wei Teng, Xin-Le Geng, Yi-Fan Zhu, Yong-Hong Guan, Xiaohui Fan
      Abstract: A simple AlCl3-catalyzed condensation/cyclization cascade process between aldehydes and sulfonamide is reported, in which two new bonds and one five-membered ring are simultaneously formed with water as the byproduct. This method provides a rapid access to indenamine and 9-aminofluorene derivatives. Additionally, these products can be transformed into corresponding indanones and fluorenones under the developed conditions.A simple two-component condensation/cyclization cascade process to indene and fluorene derivatives was disclosed, in which two new bonds and one five-membered ring are simultaneously formed with water as the byproduct.
      PubDate: 2017-05-16T03:15:34.130495-05:
      DOI: 10.1002/aoc.3863
       
  • Ionic liquid-functionalized mesoporous silica nanoparticles
           ([pmim]FeCl4/MSNs): Efficient nanocatalyst for solvent-free synthesis of
           N,N′-diaryl-substituted formamidines
    • Authors: Zahra Nasresfahani; Mohammad Zaman Kassaee, Esmaiel Eidi
      Abstract: We report the synthesis of ionic liquid-functionalized mesoporous silica nanoparticles ([pmim]FeCl4/MSNs) via a method of post-grafting on parent MSNs. This hybrid material was characterized using scanning and transmission electron microscopies, energy-dispersive X-ray spectroscopy, nitrogen adsorption–desorption analysis, Fourier transform infrared spectroscopy, powder X-ray diffraction and thermal analyses. The material was utilized as an efficient heterogeneous catalyst for the synthesis of N,N′-diaryl-substituted formamidines through the reaction of triethyl orthoformate with arylamines under solvent-free conditions. The catalyst was recovered easily and reused several times without significant loss of its catalytic activity.The catalytic performance of nanoparticles ([pmim]FeCl4/MSNs) is confirmed for the synthesis of N,N′-diaryl-substituted formamidines through the reaction of triethyl orthoformate with arylamines.
      PubDate: 2017-05-16T02:55:40.228732-05:
      DOI: 10.1002/aoc.3800
       
  • Spin states in biochemistry and inorganic chemistry: Influence on
           structure and reactivity. Edited by Marcel Swart, Miquel Costas. Wiley,
           2015. No. of pages: 472 €150.30, £120.00 (hardcover); €108.99,
           £135.99 (E-book), ISBN: 978–1–118-89831-4
    • Authors: Gareth R. Eaton
      PubDate: 2017-05-16T02:40:38.841301-05:
      DOI: 10.1002/aoc.3836
       
  • Rh(I) complexes with new C2-symmetric chiral diphosphoramidite ligands:
           Catalytic activity for asymmetric hydrogenation of olefins
    • Authors: Dario Drommi; Carmela Grazia Arena
      Abstract: The design and synthesis of three new C2-symmetric chiral diphosphoramidite ligands starting from simple and cheap building blocks have been developed. Rhodium(I) cationic complexes bearing these chelate ligands have been prepared and applied in asymmetric hydrogenation of model olefins. A rhodium complex with a diphosphoramidite containing a chiral diamine configurationally stable and two fluxional chiral biphenyl units gave higher enantioselectivity with increasing hydrogen pressure (87% ee) in the hydrogenation of dimethyl itaconate.The design and synthesis if three new C2-symmetric chiral diphosphoramidite ligands starting from simple and cheap building blocks have been developed. Rhodium(I) cationic complexes bearing these chelate ligands have been prepared and applied in asymmetric hydrogenation of model olefins. A rhodium complex with a diphosphoramidite containing a chiral diamine configurationally stable and two fluxional chiral biphenyl units gave higher entantioselectivity with increasing hydrogen pressure (87% ee) in the hydrogenation of dimethyl itaconate.
      PubDate: 2017-05-16T02:40:35.835051-05:
      DOI: 10.1002/aoc.3837
       
  • Synthesis of Co(II), Cu(II), Hg(II), UO2(II) and Pb(II) binuclear
           nanometric complexes from multi-donor ligand: Spectral, modeling,
           quantitative structure–activity relationship, docking and antitumor
           studies
    • Authors: Jabir H. Al-Fahemi; Fawaz A. Saad, Nashwa M. El-Metwaly, Thoraya A. Farghaly, Marwa G. Elghalban, Kamel A. Saleh, Gamil A. Al-Hazmi
      Abstract: New synthesis of Co(II), Cu(II), Hg(II), UO2(II) and Pb(II) binuclear nanometric complexes derived from multi-donor ligand is reported. Structural and molecular formulae of all isolated complexes were established. Bi-negative hexa-dentate mode of ligand was proposed for the two central atoms in all complexes. Infrared, UV–visible, magnetic moments, electron paramagnetic resonance, thermogravimetric analysis and elemental analysis were used to build all structural formulae. X-ray diffraction and scanning electron microscopy were used to determine the morphological features of the compounds and to compute particle sizes. Theoretical computations were implemented to support the proposed formulae. Kinetic study was executed over suitable stages to clarify the comparative stabilities. The DFT/B3LYP method, using the Gaussian 09 program, was utilized for optimizing the distribution of atoms over all compounds except the UO22+ complex. This exclusion refers to an inability to find a suitable method. Significant parameters were estimated using frontier energies (highest occupied and lowest unoccupied molecular orbitals) and data log file. A quantitative structure–activity relationship study applying HyperChem was executed for the organic compound tautomer forms to give a significant view about their biological character. AutoDock tools 4.2 were used to investigate the biological trend of organic compounds (keto and enol) against three types of proteins. The types were chosen related to in vitro investigation: breast, prostate and liver carcinoma proteins. IC50 values indicated insignificant inhibition activity towards all carcinoma cell lines under investigation, except for the Hg(II) complex which displayed distinct activity against breast carcinoma compared with reference drug (doxorubicin).The bi-negative hexa-dentate ligand was proposed with all metal ions. Essential parameters were extracted to predict biological features for most stable stereo structures through molecular modeling and docking studies. A poor impact was recorded for the complexes against all three utilized carcinoma cell lines, except for the Hg(II) complex, which displayed a promising result against breast carcinoma
      PubDate: 2017-05-16T02:35:58.352595-05:
      DOI: 10.1002/aoc.3787
       
  • Terbium–organic framework as heterogeneous Lewis acid catalyst for
           
    • Authors: Meghdad Karimi; Taraneh Hajiashrafi, Akbar Heydari, Alireza Azhdari Tehrani
      Abstract: A terbium–organic framework (Tb-MOF) was prepared using a previously reported procedure. Tb-MOF was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, powder X-ray diffraction and surface area analysis. Tb-MOF was employed as a heterogeneous Lewis acid catalyst for the synthesis of β-aminoalcohols. Also, the effect of ultrasonic irradiation was examined in the catalytic aminolysis of styrene oxide. The reaction conditions were optimized by variation of reaction time, catalyst concentration and solvent. A variety of β-aminoalcohols were synthesized and characterized. The Tb-MOF catalyst showed excellent selectivity and high yield for these transformations.A terbium–organic framework (Tb-MOF) was prepared, characterized and employed as a heterogeneous Lewis acid catalyst for the synthesis of β-aminoalcohols.
      PubDate: 2017-05-16T02:35:34.464623-05:
      DOI: 10.1002/aoc.3866
       
  • Pd- Dithizone grafted onto magnetic nanoparticles and study of its
           catalyticactivity in C-C and C-N coupling reactions
    • Authors: Arash Ghorbani-Choghamarani; Hossein Rabiei, Fatemeh Arghand
      Abstract: In this paper, we report a simple, facile and efficient method for the synthesis of Fe3O4/SiO2-DTZ-Pd. The immobilized palladium was an efficient catalyst without addition of phosphine ligands for Stille, Heck and N-arylation reactions. This method has some advantages such as high yields and easy work up of products. In addition, the catalyst can be recovered using a magnet and reused several times without significant loss of its catalytic activity. This catalyst was characterized by various physico-chemical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and inductively coupled plasma (ICP).An efficient palladium dithizone complex was immobilized on Fe3O4 magnetic nanoparticles and characterized by different techniques. The catalytic activity of this catalyst was examined in the C-C and C-N coupling reactions.
      PubDate: 2017-05-16T02:25:35.71828-05:0
      DOI: 10.1002/aoc.3839
       
  • Synthesis and antimicrobial activity of bulky 3,5-di-tert-butyl
           substituent-containing silver–N-heterocyclic carbene complexes
    • Authors: Nazan Kaloğlu; İlknur Özdemir, Selami Günal, İsmail Özdemir
      Abstract: A series of novel benzimidazolium bromides containing bulky 3,5-di-tert-butyl group were synthesized in high yields as N-heterocyclic carbene (NHC) ligands. These NHC ligands were metallated with Ag2O under moderate conditions to give novel silver–NHC complexes. The structures of all compounds were characterized using 1H NMR, 13CNMR, infrared and elemental analysis techniques, which supported the proposed structures. The silver–NHC complexes were screened for their in vitro antimicrobial activities against the standard bacterial strains Enterococcus faecalis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa and the fungal strains Candida albicans and C. tropicalis. The results showed that most of the silver–NHC complexes inhibited the growth of all bacterial strains and fungal strains and were found to display effective antimicrobial activity against different microorganisms.Novel benzimidazolium bromides and their silver–NHC complexes were synthesized. These complexes were tested against Gram-negative bacteria (E. coli and P. aeruginosa), Gram-positive bacteria (E. faecalis and S. aureus) and fungi (C. albicans and C. tropicalis). The result showed that most of the silver–NHC complexes had good activities against the various microorganisms.
      PubDate: 2017-05-15T06:26:42.422327-05:
      DOI: 10.1002/aoc.3803
       
  • One-pot carboxylative cyclization of propargylic alcohols and CO2
           catalysed by N-heterocyclic carbene/Ag systems
    • Authors: Ye Yuan; Yu Xie, Dandan Song, Cheng Zeng, Somboon Chaemchuen, Cheng Chen, Francis Verpoort
      Abstract: A series of N-heterocyclic carbene (NHC)/Ag systems were developed for the carboxylative assembly of propargylic alcohols and carbon dioxide (CO2). With the catalysis of these catalytic systems, a variety of target α-alkylidene cyclic carbonates could be obtained smoothly under atmospheric CO2 pressure in straightforward one-pot processes. Particularly, these reactions could be performed without any stoichiometric addition of bases or additives. Further mechanistic investigation reveals that the excellent activities are attributed to the effective activations of CO2 accomplished by the NHCs via the formation of the NHC-CO2 adducts.A series of N-heterocyclic carbene (NHC)/Ag systems were developed for the carboxylative assembly of propargylic alcohols and carbon dioxide (CO2). Desired products were obtained in one-pot processes under atmospheric CO2 pressure without additives and bases. The excellent activities are attributed to the efficient activations of CO2 via a NHC-CO2 adducts.
      PubDate: 2017-05-15T06:16:17.621775-05:
      DOI: 10.1002/aoc.3867
       
  • Calotropis procera mediated one pot green synthesis of Cupric oxide
           nanoparticles (CuO-NPs) for adsorptive removal of Cr(VI) from aqueous
           solutions
    • Authors: Shikha Dubey; Yogesh Chandra Sharma
      Abstract: The present study deals with the synthesis of CuO-NPs via green route and investigated its application for removal of Cr(VI) from aqueous solutions. The experimental parameters were optimized through Box–Behnken Design (BBD) of response surface methodology for the optimum response. The adsorption equilibrium data was well fitted to Freundlich isotherm model and the kinetics was explained through pseudo-second-order kinetic model. The overall process was feasible, spontaneous and exothermic. Linear approach for analysing the isotherm as well as kinetic parameters was found more appropriate than the non-linear approach. The adsorbent was successfully regenerated and reused up to five consecutive cycles without significant loss in removal capacity. The experimental results exhibited that CuO-NPs can be a good alternative for Cr(VI) removal from aqueous solutions.The CuO-Nano particles, synthesized via green route were used for the removal of Cr(VI) from aqueous solutions. Process of removal was optimized by response surface methodology. The data fitted Freundlich isotherm model and the process of removal followed second order kinetics. Linear approach for analysing the isotherm as well as kinetic parameters was found more appropriate than the non-linear approach. The adsorbent was successfully regenerated and reused up to five cycles. CuO-NPs can be a good alternative for Cr(VI) removal from aqueous solutions.
      PubDate: 2017-05-15T06:11:54.947156-05:
      DOI: 10.1002/aoc.3849
       
  • Pallada- and platinacycle complexes of phosphorus ylides; synthesis, X-ray
           characterization, theoretical and electrochemical studies and application
           of Pd(II) complexes as catalyst in Suzuki-Miyaura coupling reaction
    • Authors: Seyyed Javad Sabounchei; Asieh Sedghi, Ali Hashemi, Marjan Hosseinzadeh, Mehdi Bayat, Robert W. Gable
      Abstract: The new unsymmetrical phosphonium salts [Ph2PCH2PPh2CH2C(O)C6H4R]Br (R= m-Br (S1) and p-CN (S2)) were synthesized in the reaction of 1,1-bis(diphenylphosphino)methane (dppm) and BrCH2C(O)C6H4R (R= m-Br and p-CN) ketones, respectively. Further treatment with NEt3 gave the α-keto stabilized phosphorus ylides Ph2PCH2PPh2C(H)C(O)C6H4R (R= m-Br (Y1) and p-CN (Y2)). These ligands were reacted with [MCl2(cod)] (M= Pd and Pt; cod= 1,5-cyclooctadiene) to give the pallada- and platinacycle complexes [MCl2(Ph2PCH2PPh2C(H)C(O)C6H4R)] (M= Pd, R= m-Br (3); R= p-CN (4) and M= Pt, R= m-Br (5); R= p-CN (6)). Cyclic voltammetry, elemental analysis, IR and NMR (1H, 13C and 31P) spectroscopic methods were used for characterization of the obtained compounds. Further, the structure of complexes 3 and 4 were characterized crystallographically. Palladacycles 3 and 4 were proved to be excellent catalysts for the Suzuki-Miyaura coupling reactions of various aryl chlorides and arylboronic acids in mixed DMF/H2O media. Also, the bonding situations between two interacted fragments [PtCl2] and Y1 and Y2 ligands in platinacycles 5 and 6 were investigated based on DFT method by using NBO, EDA and ETS-NOCV analysis.We report the synthesis and characterization of new pallada- and platinacycle complexes [MCl2(Ph2PCH2PPh2C(H)C(O)C6H4R)] (M= Pd and Pt, R = m-Br and p-CN) and application of Pd(II) complexes as catalyst in Suzuki-Miyaura coupling reaction.
      PubDate: 2017-05-12T00:29:36.471155-05:
      DOI: 10.1002/aoc.3850
       
  • Nickel-catalyzed oxidative esterification of formamides with
           1,3-dicarbonyl compounds under mild reaction conditions
    • Authors: Dariush Saberi; Samira Poorsadeghi
      Abstract: Synthesis of enol carbamates was achieved via nickel-catalyzed oxidative coupling of formamides with 1,3-dicarbonyl compounds in the presence of tert-butyl hydroperoxide at 40 °C. Various derivatives of enol carbamates were synthesized by this method in good to excellent yields.C-O bond formation between formamides and 1,3-dicarbonyls toward the synthesis of the corresponding carbamates in the presence of NiCl2 as a new, cheap and effectice catalyst.
      PubDate: 2017-05-12T00:24:36.565823-05:
      DOI: 10.1002/aoc.3855
       
  • Hexanuclear and Tetranuclear Mn/Ln clusters using
           2-(hydroxymethyl)pyridine: Synthesis, structures and magnetic properties
    • Authors: Lei Sun; Hui Chen, Changneng Chen
      Abstract: Reactions of manganese benzoate dihydrate and lanthanide nitrate hexahydrate with 2-(hydroxymethyl)pyridine (hmpH) as ligand in the mixture solutions of acetonitrile and ethanol according to different molar ratios of NEt3 generated two kinds of Mn-Ln compounds [MnIII4LaIII2(O)2(hmp)7(PhCO2)2(NO3)5] ·5H2O (1) and [MnIII2GdIII2(hmp)6(PhCO2)4(NO3)2] ·3CH3CN·3C2H5OH·2H2O (2). By comparison of the two compounds, there exist considerable effects of reaction alkalinity on the structures and magnetic properties of products. Compound 1 possesses a core of [MnIII4LaIII2(μ4-O)(μ3-O)(μ3-OR)(μ2-O)7]2−, which comprises three face-sharing defected cubane units. The core topology represents a new core type of Mn-Ln clusters. Compound 2 has a planar-butterfly structure. The solid-state dc magnetic susceptibility analyses indicate the antiferromagnetic interactions within compound 1 and ferromagnetic interactions within compound 2. Compound 1 has an S = 0 ground state, while compound 2 possesses an S = 11 ground state, fitting of the dc data for the tetranuclear Mn2Gd2 with the Magpack program gives parameters of JMn-Mn = 3.11 cm−1, JMn-Gd = 0.02 cm—1 and g = 1.96.The hexanuclear and tetranuclear compounds were synthesized by the same reaction except alkalinity reaction condition. By comparsion of the two compounds, there exist considerable effects of alkalinity on the structures and magnetic properties of compounds.
      PubDate: 2017-05-11T23:58:53.983992-05:
      DOI: 10.1002/aoc.3846
       
  • Synthesis of phenanthridine and phenanthridinone derivatives based on
           Pd-catalyzed C–H activation
    • Authors: Fatemeh Rafiee
      Abstract: This review article provides an overview of the most recent and exciting developments in palladium-catalyzed C–H activation and mechanistic aspects of these catalytic reactions as the fast-growing field for the synthesis of phenanthridine derivatives.This review describes the recent developments in palladium-catalyzed C–H functionalization strategies for the synthesis of biologically active phenanthridine and phenanthridinone derivatives.
      PubDate: 2017-05-11T03:46:35.436078-05:
      DOI: 10.1002/aoc.3820
       
  • Direct synthesis of Fe(III) immobilized Zr-based metal–organic framework
           for aerobic oxidation reaction
    • Authors: Xin Shu; Ying Yu, Yi Jiang, Yi Luan, Daniele Ramella
      Abstract: A Zr-based metal–organic framework with bipyridine units (UiO-67) has been utilized for the immobilization of catalytically active iron species via a post-synthetic metalation method. UiO-67 bipyridine MOF was synthesized through a simple solvothermal method and was shown to have a UiO-type structure. Post-synthetic metalation of UiO-67 MOF was performed for the immobilization of the catalytically active FeCl3. FT-IR and EDX element map suggested that FeCl3 is coordinately bonded to the UiO-67 bipyridine framework. The synthesized UiO-67-FeCl3 catalyst was used for the aerobic oxidation of alcohols and benzylic compounds in the presence of molecular oxygen. In addition, the UiO-67-FeCl3 catalyst can be reused as a solid heterogeneous catalyst without compromising its activity and selectivity.Zr-derived MOF supported Iron(III) salts was utilized as the heterogeneous catalyst. It is a green alcohols oxidation using molecular oxygen as oxygen source. High efficiency in aerobic oxidation reactions was achieved and catalyst demonstrated great recyclability.
      PubDate: 2017-05-11T03:45:52.692749-05:
      DOI: 10.1002/aoc.3862
       
  • Non-covalent Interactions in the Synthesis and Design of New
           CompoundsEdited by Abel M. Maharramov, Kamran T. Mahmudov, Maximilian N.
           Kopylovich, Armando J. L. PombeiroWiley, 2016; Hardcover £156.00,
           €187.20. 480 pages. ISBN: 978–1–119–10989–1.
    • Authors: Scott L. Cockroft
      PubDate: 2017-05-11T03:45:25.592092-05:
      DOI: 10.1002/aoc.3872
       
  • Sulfonic acid supported on magnetic nanoparticle as an eco-friendly,
           durable and robust catalyst for the synthesis of β-amino carbonyl
           compounds through solvent free Mannich reaction
    • Authors: Farhad Kabiri Esfahani; Daryoush Zareyee, Ali Shokuhi Rad, Sima Taher-Bahrami
      Abstract: A simple, efficient and environmentally benign solid acid catalyst was prepared by anchoring a propyl sulfonic acid on the surface of silica-coated magnetic nanoparticles by low cost precursors. The catalyst has been then engaged in the efficient β-amino carbonyl compounds production via three component Mannich reaction under solvent free reaction condition at room temperature. After the completing the reaction, the catalyst was readily separated by external magnet and reused for 10 successive rounds of reaction, without any significant loss in catalytic efficiency. The solid acidic system presented reusable strategy for the efficient synthesis of β-amino carbonyl compounds, simplicity in operation, and green aspects by avoiding toxic conventional catalysts under solvent-free condition.An environmentally benign core-shell magnetic nanoparticle solid acid catalyst (Fe3O4@SiO2@PrSO3H) has been engaged in the efficient β-amino carbonyl compounds production via three component Mannich reaction under solvent free reaction condition at room temperature. After the completing the reaction, the catalyst was readily separated by external magnet and reused for 10 successive rounds of reaction, without any significant loss in catalytic efficiency.
      PubDate: 2017-05-11T03:41:27.86485-05:0
      DOI: 10.1002/aoc.3865
       
  • Carboxylate ion dependency in the Cu(II) catalysed asymmetric Henry
           reaction: Structural characterisation of a tridentate Schiff base complex
           containing a coordinated carboxylic acid
    • Authors: Arzu Akıncı; Duygu Barut Celepci, Leman Karadeniz, Neslihan Korkmaz, Muhittin Aygün, Stephen T. Astley
      Abstract: Six tridentate Schiff base ligands containing tertiary butyl or benzyl substituents were prepared from chiral amino alcohols and salicylaldehyde derivatives. The ligands were employed as catalysts for the Cu(II) catalysed asymmetric Henry reaction. It was discovered that when different carboxylate salts were used instead of copper acetate as the Cu(II) salt, significant changes in the enantioselectivity of the reactions were observed. Addition of Cu(OAc)2 to the ligand prepared from salicylaldehyde and α,α-diphenyl-tert-leucinol resulted in the formation of dark green crystals. X-ray structural analysis of these crystals showed that a square planar monomeric complex had been formed rather than the expected dimer. In the structure, the copper(II) centre is bonded to the tridentate ONO ligand and an acetate ion. There is a strong hydrogen bond between the protonated alcoholic oxygen of the Schiff base ligand and the uncoordinated acetate oxygen atom. These results, taken together, indicate that the carboxylate anion may be an important part of the active intermediate when this type of copper complex is used as a catalyst in the asymmetric Henry reaction.The catalytic enantioselectivity in the Henry reaction exhibited by Cu(II) complexes of chiral tridentate Schiff base ligands was found to depend on the carboxylate counter anion. A possible reason for this dependency can be seen in the X-ray crystal structure of a monomeric Cu(II) ONO complex in which a ligand O atom has been protonated and is hydrogen bonded to an acetate anion.
      PubDate: 2017-05-11T03:35:44.986185-05:
      DOI: 10.1002/aoc.3831
       
  • Nano–Mn-[4-nitrophenyl-salicylaldimine-methyl pyranopyrazole]Cl2 as a
           new nanostructured Schiff base complex and catalyst for the synthesis of
           hexahydroquinolines
    • Authors: Ahmad Reza Moosavi-Zare; Hamid Goudarziafshar, Lida Ghaffari
      Abstract: By the reaction of 4-nitrobenzaldehyde with ethyl acetoacetate, malononitrile and hydrazine hydrate, pyranopyrazole derivative as an active biological compound was synthsized and then reacted with salicylaldehyde and MnCl2.4H2O to afford nano-Mn-[4-nitrophenyl-salicylaldimine-methyl pyranopyrazole]Cl2 (nano-[Mn-4NSMP]Cl2) for the first time. The produced Schiff base complex with nanostructured was fully characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential thermal gravimetric (DTG) and scanning electron microscope (SEM) and used it as an efficient catalyst for the preparation of hexahydroquinolines.Nano-Mn-[4-nitrophenyl-salicylaldimine-methyl pyranopyrazole]Cl2 (nano-[Mn-4NSMP]Cl2) was synthesized, characterized and successfully tested as a catalyst on the synthesis of hexahydroquinolines.
      PubDate: 2017-05-11T03:31:22.365288-05:
      DOI: 10.1002/aoc.3845
       
  • Selective synthesis of 3-Selanylindoles from Indoles and Diselenides using
           IK/mCPBA system
    • Authors: Hongjie Li; Xiaolong Wang, Jie Yan
      Abstract: In the presence of a catalytic amount of KI combined with oxidant mCPBA, a convenient catalytic procedure is developed for the preparation of 3-selanylindoles from indoles and diselenides. In this protocol, KI is first oxidized by mCPBA into hypoiodous acid, which reacts with diselenide to cleave Se-Se bond. The in situ generated active electrophilic selenium species then reacts with indole, affording 3-selanylindole via an electrophilic substitution mechanism. This catalytic selenation of indoles has mild reaction conditions and is a simple procedure, which extends the synthetic application of KI in organic synthesis.A convenient procedure catalyzed by KI was developed for the preparation of 3-selanylindoles from indoles, diselenides and mCPBA at room temperature, which providing a series of 3-selanylindoles with high regioselectivity and in good yields.
      PubDate: 2017-05-11T03:30:37.35734-05:0
      DOI: 10.1002/aoc.3864
       
  • Industrial Catalysis: A Practical Approach, Jens Hagen 3rd Edition
           Wiley-VCH, 2015; Hardcover £120, €144. 544 pages. ISBN:
           978-3-527-33165-9
    • Authors: James McGregor
      PubDate: 2017-05-11T03:26:53.140898-05:
      DOI: 10.1002/aoc.3841
       
  • Synthesis of Fe3O4@SiO2@DOPisatin-Ni(II) and Cu(II) nanoparticles: Highly
           efficient catalyst for the synthesis of sulfoxides and disulfides
    • Authors: Maryam Hajjami; Fatemeh Sharifirad, Fatemeh Gholamian
      Abstract: The catalytic activity of two magnetic catalysts Fe3O4@SiO2@DOPisatin-M(II) (M = Ni, Cu) was investigated in the environmentally green H2O2 oxidant-based oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. By using these catalysts, various substrates were successfully converted into their corresponding product. These catalysts could also be reused multiple time without significant loss of activity. The physical and chemical properties of the catalysts were determined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), energy dispersive X-ray spectroscopy (EDX) and atomic absorption spectroscopy (AAS).The catalytic activity of two magnetically catalyst Fe3O4@SiO2@DOPisatin-Ni (II) and Fe3O4@SiO2@DOPisatin-Cu (II) was investigated in the oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. These catalysts also could be recycled consecutively several times without significant loss of activity. The physical and chemical properties of the catalysts were charecterised using XRD, SEM, EDX, TGA, VSM and FT-IR spectroscopy.
      PubDate: 2017-05-08T05:29:41.234764-05:
      DOI: 10.1002/aoc.3844
       
  • Thiourea dioxide-grafted γ-Fe2O3/HAp magnetic nanoparticles: Efficient,
           green and reusable nanocatalyst for synthesis of pyranopyridine
           derivatives
    • Authors: Davood Azarifar; Masoumeh Ghaemi
      Abstract: A novel thiourea dioxide-functionalized hydroxyapatite-encapsulated hybrid core-shell γ-Fe2O3@HAp-TUD nanoparticles (MNPs) were prepared and characterized by FT-IR, EDX, SEM, XRD, TGA and VSM analytical methods. The catalytic activity of these MNPs was evaluated through one-pot three-component reactions between various substituted aldehydes, malononitrile and 3-cyano-6-hydroxy-4-methyl-pyridin-2(1H)-one to afford the corresponding pyrano[2,3-b]pyridines in high yields under mild and solvent-free conditions. The catalyst can be easily recycled in a magnetic field and reused in five consecutive runs without significant decrease of its catalytic activity.An efficient and convenient procedure has been described for one-pot multi-component synthesis of pyrano[2,3-b]pyridines derivatives in the presence of γ-Fe2O3@HAP-TUD MNPs as a heterogeneous catalyst. The reactions proceeded smoothly under solvent free condition to afford the corresponding products in quantitative yields. The catalyst can be easily recovered by an external magnet and reused for several successive fresh runs with no significant loss of catalytic activity.
      PubDate: 2017-05-08T05:25:16.706803-05:
      DOI: 10.1002/aoc.3834
       
  • Zinc(II) complexes of Triaza and Amidinate ligands: Efficient initiators
           for the ring-opening polymerization of ε-Caprolactone and rac-Lactide
    • Authors: Bakthavachalam Kirubakaran; Raghavendra Beesam, Dastagiri Reddy Nareddula
      Abstract: Zinc complexes supported by tertiary 1,3,5-triazapenta-1,3-dienate ligand (L1) and N-benzoyl-N′-arylbenzamidinate [aryl =2,6-diisopropylphenyl (L2), phenyl (L3)] ligands have been synthesized and characterized. The reaction of L1H with ZnEt2 affords a mononuclear zinc complex [L1ZnEt] (1) in good yield. Tetra nuclear zinc complex [(L1)2Zn4O(OAc)4] (2) is prepared by treating L1H with one equivalent of Zn(OAc)2 in toluene. Further, dinuclear zinc complexes [L2ZnEt]2 (3) and [L3ZnEt]2 (4) are obtained in good yields from L2H and L3H with ZnEt2 in toluene respectively. The complexes 1–4 have been characterized by 1H/13C NMR spectroscopy and single crystal X-ray diffraction studies. All of the complexes have been explored for their catalytic activity toward the ring-opening polymerization (ROP) of ε-caprolactone. It has been found that complex 1 is an active catalyst for the polymerization of ε-caprolactone in presence of a cocatalyst benzyl alcohol (BnOH). While complex 2 is as active as 1 there is no need for a cocatalyst for the polymerization to proceed. Dinuclear zinc complexes 3 and 4 show very high activity for the ROP of ε-caprolactone (CL) and rac-lactide (LA) without requiring a cocatalyst. The resultant polymers are found to have very high molecular weight (Mn = 296 X 103 g mol−1) and relatively narrow polydispersity index compared to 1 and 2.Mono-, di- and tetra nuclear zinc complexes were synthesized and used as initiators for the ring opening polymerization of ε-caprolactone and rac-lactide.
      PubDate: 2017-05-05T03:40:41.916179-05:
      DOI: 10.1002/aoc.3833
       
  • Polymer supported copper(II) amine-imine complexes in the C-N and A3
           coupling reactions
    • Authors: Agnieszka Bukowska; Wiktor Bukowski, Karol Bester, Krzysztof Hus
      Abstract: New polymer supported Cu(II) complexes based on an epoxy functionalized gel type resin were prepared using the multi-stage procedures. The reactions of epoxy groups with ethylenediamine or tris(2-aminoethyl)amine, and then NH2 groups with salicylaldehydes were used for the preparation of a series of amine-imine functionalized polymer supports. Copper(II) acetate was used as a source of metal ions. The complexes were characterized using ICP-OES, FTIR, DR UV–Vis and TGA techniques, and tested as catalysts in two model C-N and a series of A3 coupling reactions. Their catalytic activity was rather low in the C-N coupling reactions between imidazole and iodobenzene or phenylboronic acid. However, the second of the reactions could be conducted effectively under milder conditions. The complexes were efficient used as recyclable catalysts in the A3 coupling reactions. A series of aromatic aldehydes and secondary amines and phenylacetylene could be coupled using 1% mol catalyst.New polymer supported Cu(II) complexes were prepared based on an epoxy functionalized gel, characterized using ICP-OES, FTIR, DR UV-Vis and TGA techniques and tested as catalysts in two model C-N and A3 coupling reactions. Their activity was rather low in the coupling reactions between imidazole and iodobenzene or phenylboronic acid. However, they could be used efficiently as recyclable catalysts in the A3 coupling reactions between aromatic aldehydes and secondary amines and phenylacetylene.
      PubDate: 2017-05-05T03:35:50.637853-05:
      DOI: 10.1002/aoc.3847
       
  • Chloroaluminate ionic liquid-modified silica-coated magnetic
           nanoparticles: Efficient and reusable catalyst for selective synthesis of
           mono- and bis-dihydropyrano[3,2-b]chromenediones
    • Authors: Ehsan Estakhri; Mahboobeh Nasr-Esfahani, Iraj Mohammadpoor-Baltork, Shahram Tangestaninejad, Majid Moghadam, Valiallah Mirkhani
      Abstract: The synthesis, characterization and catalytic activity of chloroaluminate ionic liquid-modified silica-coated magnetic nanoparticles ([SiPrPy]AlCl4@MNPs) are described. The prepared magnetic nanocatalyst was characterized using Fourier transform infrared spectroscopy, elemental analysis, vibrating sample magnetometry, scanning and transmission electron microscopies, X-ray diffraction and inductively coupled plasma analysis. The results showed that the ionic liquid had been successfully immobilized onto the magnetic support, and the resulting nanoparticles exhibited high catalytic activity for the synthesis of a diverse range of dihydropyrano[3,2-b]chromenediones via a one-pot, three-component and solvent-free reaction of aromatic aldehydes, 1,3-diones and kojic acid. This catalytic system also showed excellent activity in the selective synthesis of mono- and bis-dihydropyrano[3,2-b]chromenediones from dialdehydes. The procedure gave the products in excellent yields and in very short reaction times. Moreover, the catalyst could be reused eight times without loss of its catalytic activity.An efficient method is reported for the synthesis of substituted as well as mono- and bis-dihydropyrano[3,2-b]chromenediones in the presence of chloroaluminate ionic liquid-modified silica-coated magnetic nanoparticles ([SiPrPy]AlCl4@MNPs) as a reusable catalyst under solvent-free conditions.
      PubDate: 2017-05-05T00:45:35.731506-05:
      DOI: 10.1002/aoc.3799
       
  • The use of SrFe12O19 magnetic nanoparticles as an efficient catalyst in
           the modified Niementowski reaction
    • Authors: Ghodsi Mohammadi Ziarani; Zhila Kazemi Asl, Parisa Gholamzadeh, Alireza Badiei, Morteza Afshar
      Abstract: Nanomagnetic SrFe12O19 was synthesized through a simple sol–gel auto-combustion and then characterized by FT-IR, XRD, EDXA, VSM, BET and SEM image. Moreover, it was used as catalyst for the first time in the modified Niementowski reaction to investigate its catalytic activity. According to the high yield of quinazolinone products obtained within short reaction times, it was found that SrFe12O19 can be used as an effective and green nanocatalyst in organic reactions. The nanomagnetic catalyst can be easily separated from the reaction mixture using an external magnet.Nanomagnetic SrFe12O19 was synthesized through a simple sol-gel auto-combustion and characterized by FT-IR, XRD, EDXA, VSM, BET and SEM image. Its catalytic activity was then investigated in the Niementowski reaction.
      PubDate: 2017-05-05T00:40:32.051456-05:
      DOI: 10.1002/aoc.3830
       
  • (n-Bu2Sn)2O(CO3): An active, robust and recyclable organotin(IV) for the
           direct synthesis of linear organic carbonates from carbon dioxide and
           alcohols
    • Authors: Sreevardhan Reddy Sanapureddy; Laurent Plasseraud
      Abstract: Organotin(IV) compounds are known to promote the direct synthesis of organic carbonates from carbon dioxide and alcohols. In the past, structural studies have highlighted that the carbonato moiety is a recurring ligand of tin species collected during CO2 pressurized reactions. In a mimetic approach and in order to achieve an available and recyclable precursor, the title compound (n-Bu2Sn)2O(CO3) (1) was prepared in a single step by reacting commercial di-n-butyltin dichloride with an aqueous solution of sodium carbonate. Compound 1 was characterized using infrared spectroscopy and thermogravimetric and elemental analyses. Multinuclear NMR investigations in solution were also conducted. Compound 1 was then evaluated for the direct carbonation of alcohols (methanol, ethanol, n-butanol and isopropanol) under CO2 pressure. Recycling experiments were performed showing the efficient reuse of 1 without loss of activity. Furthermore, the infrared fingerprint of 1 was preserved even after several runs demonstrating a good stability. The effects of pressure and of reaction time on dimethyl carbonate formation were also studied.(n-Bu2Sn)2O(CO3), prepared in a single step from di-n-butyltin dichloride, was evaluated as a promotor for the direct carbonation of alcohols (methanol, ethanol, n-butanol and isopropanol).
      PubDate: 2017-05-05T00:37:05.660367-05:
      DOI: 10.1002/aoc.3807
       
  • AgPt nanoparticles supported on magnetic graphene oxide nanosheets for
           catalytic reduction of 4-nitrophenol: Studies of kinetics and mechanism
    • Authors: Mona Kohantorabi; Mohammad Reza Gholami
      Abstract: AgxPt100−x (x = 0, 25, 50, 75 and 100) nanoparticles were grown on the surface of magnetic graphene oxide nanosheets (Fe3O4@GO) for the first time. The as-prepared nanocomposites were characterized using various techniques such as Fourier transform infrared spectroscopy, powder X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer–Emmett–Teller surface area analysis, vibrating sample magnetometry and thermogravimetric analysis. The Fe3O4@GO-AgxPt100−x catalysts were applied in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol using sodium borohydride (NaBH4). The synthesized nanocomposites exhibited excellent catalytic performance in the reduction of 4-NP with high recyclability for five consecutive runs. The Fe3O4@GO-Ag75Pt25 nanocomposite exhibited the best catalytic activity with a rate constant as high as 140.6 × 10−3 s−1. The obtained kinetic data were modelled with the Langmuir–Hinshelwood equation. The energy of activation and thermodynamic parameters including enthalpy, entropy of activation and activation Gibbs free energy were calculated.AgPt nanoparticles were grown on the surface of magnetic graphene oxide nanosheets.Fe3O4@GO-AgxPt100−x catalysts showed excellent catalytic activity for reduction of 4-NP to 4-AP.Mechanism of reaction was studied, and thermodynamic parameters were calculated.
      PubDate: 2017-05-05T00:37:00.680126-05:
      DOI: 10.1002/aoc.3806
       
  • Practical and theoretical aspects of Wacker oxidation of tolanophanes:
           Synthesis and characterization of novel diketonic cyclophanes
    • Authors: Hossein Reza Darabi; Saeed Rastgar, Ehsan Khatamifar, Kioumars Aghapoor, Hani Sayahi, Rohoullah Firouzi
      Abstract: Novel cyclophanes having 1,2-diketones 2a–c were synthesized by Wacker oxidation of the corresponding tolanophanes 1a–c having various alkyl chain lengths (n = 2–4). Among them, tolanophane 1a with the shortest alkyl chain length (n = 2) having more strained alkyne shows the lowest product selectivity even lower than that of acyclic analogues at various reaction temperatures. In contrast, the oxidation of tolanophane 1b (n = 3) is clean with the highest activity and selectivity of 2b. Theoretical calculations confirm the experimental data. Based on ab initio calculations, the critical step of the reaction pathway is the interaction of oxygen atoms of 1 (in the absence of H2O) with Pd ion of intermediate [PdCl3(1)]− to give [PdCl2(1)] which keeps Pd ion close to the alkyne bond. This step is not observed computationally for 1a because the positions of the oxygen atoms are outside of its central part. This is in good agreement with almost no activity of 1a at room temperature to prove its rigid structure preventing the O…Pd interaction. Nevertheless, the alkyne…Pd interaction of 1b is not detected by NMR measurements which may be due to its too slow interaction at room temperature (35% after 24 h); however, this confirms ab initio calculation data that the preferred coordinating site is oxygen in the reaction pathway. In contrast, cyclic voltammetry measurements distinguish a different behaviour for the palladium complexation of 1. In general, it is found that the stereochemistry of tolanophanes rather than distortion of alkyne bond plays the critical role in the oxidation. The products are new and their structures were characterized.Novel cyclophanes 2a-c were synthesized by the Wacker oxidation of the corresponding 1a-c. Both experimental data and theoretical calculations confirm that the stereochemistry of tolanophanes rather than distortion of alkyne bond play the critical role in the oxidation. Accordingly, the oxidation of tolanophane 1b (n = 2) is clean with the highest activity and selectivity of 2b.
      PubDate: 2017-05-05T00:30:29.863814-05:
      DOI: 10.1002/aoc.3812
       
  • A versatile synthesis of arylaminotetrazoles by a magnetic Fe@Phendiol@Mn
           nano-particle catalyst and its theoretical studies
    • Authors: Davood Habibi; Somayyeh Heydari, Mina Afsharfarnia, Zahra Rostami
      Abstract: The Fe3O4 magnetic nano-particles were modified with 1,10-phenanthroline-5,6-diol and the relevant Mn complex (Fe@Phendiol@Mn) synthesized as a nano-magnetic heterogeneous catalyst to be used for the synthesis of various arylaminotetrazoles from various arylcyanamides and sodium azide in DMF at 120 °C. Also, the nano-catalyst characterized by different methods such as the elemental analysis (CHN), ICP, FT-IR, XRD, EDX, SEM, TEM, TG-DTA, VSM and XPS. In addition, the theoretical study of the Fe@Phendiol@Mn nano-catalyst was performed using the Gausian software. The calculated results showed that the Gibbs free energy and the standard enthalpy values are negative; therefore the complex is stable. Incidentally, the computational chemistry descriptions including the electronic chemical potential, global hardness, electrophilicity index, energy gap, global softness and electronegativity were calculated.Synthesis of a novel Fe@Phen@Mn nano catalyst.Characterization of a novel Mn nano catalyst with different methods.Application of a novel Mn nano catalyst for the synthesis of arylaminotetrazolesTheoretical studies of a novel Mn nano catalyst by the Gausian software.
      PubDate: 2017-05-05T00:26:18.763277-05:
      DOI: 10.1002/aoc.3826
       
  • Synthesis of pyrano[2,3-c]pyrazole derivatives using
           Fe3O4@SiO2@piperidinium benzene-1,3-disulfonate (Fe3O4@SiO2
           nanoparticle-supported IL) as a novel, green and heterogeneous catalyst
    • Authors: Ramin Ghorbani-Vaghei; Jafar Mahmoodi, Azadeh Shahriari, Yaser Maghbooli
      Abstract: A simple, green and efficient protocol for the one-pot four-component synthesis of pyrano[2,3-c]pyrazole derivatives produced from reaction between aryl aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate in the presence of nano magnetic piperidinium benzene-1,3-disulfonate was synthesized in water at 60 °C. The Fe3O4@SiO2 nanoparticle-supported IL was designed and synthesized. The present process offers advantages such as clean reaction, short reaction time, good to excellent yield, easy purification and easy recoverable catalyst.A green piperidinium benzene-1,3-disulfonate ionic liquid functionalized magnetic nanoparticles as a novel and efficient catalyst was used for the synthesis of 6-amino-4-(4-methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles.
      PubDate: 2017-05-05T00:25:46.858984-05:
      DOI: 10.1002/aoc.3816
       
  • Ligand Design in Metal Chemistry: Reactivity and Catalysis Edited by Mark
           Stradiotto and Rylan J. Lundgren Wiley, 2016; Hardcover £115.00,
           €143.80. 442 pages. ISBN: 978-1-118-83983-6
    • Authors: Michael P. Shaver
      PubDate: 2017-05-05T00:25:28.77637-05:0
      DOI: 10.1002/aoc.3840
       
  • Mononuclear metal (II) complexes of a Bis(organoamido)phosphate ligand
           with antimicrobial activities against Escherichia coli
    • Authors: Souvik Pal; Abhrajyoti Tarafdar, Alok Sinha, Asamanjoy Bhunia, Klaus Harms, Hari Pada Nayek
      Abstract: A new tripodal ligand [PO(NH2MePy)3] (L) (2MePy = 2-(4-methyl pyridyl)) have been synthesized by treating phosphorous oxychloride with 2-Amino-4-methylpyridine in toluene under refluxing condition. The ligand was appeared as a white solid and characterized by several standard analytical and spectroscopic techniques such as FT-IR, NMR (1H, 13C{1H} and 31P{1H}) and ESI-MS spectroscopy. The ligand (L) undergone metal-assisted hydrolysis of one P–N bond when treated it with hydrated metal nitrates, M(NO3)2·xH2O (M = Zn, Cu, Co and Ni) under hydrothermal reaction condition in DMF-H2O (1:1). This results in the formation of four mononuclear complexes [{PO2(NH2MePy)2}2M] [M = Zn (1), Cu (2), Co (3), Ni (4)], where ligand (L) hydrolyses to a anionic bis(organoamido)phosphate, [PO2(NH2MePy)2]−. All complexes were completely characterized by various analytical techniques and their solid state molecular structures were established by single crystal X-ray diffraction. All complexes are isostructural with a metal (II) ion situating at the centre of a distorted octahedron. Two tridentate [PO2(NH2MePy)2]− ligands are coordinated to metal(II) ion through N- and O-donor atoms, thus neutralizing the charge of the complex. Optical properties of all complexes in solid state have been studied. Moreover, antimicrobial activities of complexes 1–4 have been explored. To the best of our knowledge, this is the first report of such compounds investigated for their antimicrobial activities.Four metal complexes [{PO2(NH2MePy)2}2M] [M =Zn (1), Cu (2), Co (3) and Ni (4)] were obtained from the partial hydrolysis of a new tripodal ligand [PO(NH2MePy)3] (L) (2MePy = 2-(4-methyl pyridyl)) and subsequent reaction of it with hydrated metal nitrates. Complexes 2-4 are capable of killing E. Coli significantly.
      PubDate: 2017-05-05T00:20:33.824473-05:
      DOI: 10.1002/aoc.3821
       
  • Gold nanoparticles anchored onto the magnetic poly(ionic-liquid) polymer
           as robust and recoverable catalyst for reduction of Nitroarenes
    • Authors: Firouz Matloubi Moghaddam; Seyed Ebrahim Ayati, Hamid Reza Firouzi, Seyed Hassan Hosseini, Ali Pourjavadi
      Abstract: Gold nanoparticles supported on poly ionic-liquid magnetic nanoparticles (MNP@PIL@Au) were synthesized by reduction of HAuCl4 with sodium borohydride. The synthesized catalyst was characterized using by AAS, TEM, FT-IR, EDS, TGA and XRD techniques. The performance of the synthesized catalyst was investigated in the reduction of nitroarenes with NaBH4. The reaction was carried out for various nitroarenes in water and mild conditions with high yields. The catalyst selectivity for the reduction of nitro group in the presences of other functional groups such as halides and alkynes was fairly well. The recycling of the catalyst was done 8 times without any significant loss of its catalytic activity.Different types of nitroarenes were reduced using gold nanoparticles supported on MNPs@PILin the presence of NaBH4 with very good yields in water.
      PubDate: 2017-05-05T00:15:39.163782-05:
      DOI: 10.1002/aoc.3825
       
  • Copper(I) complex of 1,3-DimethylBarbituric acid modified SBA-15 and its
           catalytic role for the synthesis of 2,3-Dihydroquinazolin-4(1H)-ones and
           Imidazoles
    • Authors: Maryam Hajjami; Farshid Ghorbani, Zakieh Yousofvand
      Abstract: An efficient one-pot method for synthesis of 2,3-dihydroquinazolin-4(1H)-ones and tri/tetra substituted-1H-imidazoles has been accomplished in the presence of catalytic amounts of Cu(I)-1,3-dimethylbarbituric acid modified SBA-15 as heterogeneous catalyst with good to excellent yields. The catalyst is reusable and can be applied several times without any decrease in product yield. The synthesized catalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), thermal gravimetric analysis (TGA), N2 adsorption/desorption isotherms (BET), Fourier transform infrared spectroscopy (FT-IR) and atomic absorption spectroscopy (AAS).Cu (I)-1,3-dimethylbarbituric acid modified SBA-15 have been used as heterogeneous catalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-ones and tri/tetra substituted-1H-imidazoles with good to excellent yields. The catalyst is reusable without significant leaching of copper.
      PubDate: 2017-05-05T00:10:37.46751-05:0
      DOI: 10.1002/aoc.3843
       
  • Novel structures of Zn(II) biometal cation with the biologically active
           substituted acetic acid and nitrogen donor ligands: Synthesis, spectral,
           phosphate diester catalytic hydrolysis and anti-microbial studies
    • Authors: Hijazi Abu Ali; Shayma Kamel, Amani Abu Shamma
      Abstract: The complexes [Zn(methoxyacetate)21,10-phenanthroline] 1 and [Zn2(phenylacetate)4(quinoline)2] 2, were prepared and characterized by IR-spectroscopy, UV–Visible spectroscopy, 1H and 13C NMR spectroscopy, single crystal X-ray diffraction. BNPP hydrolysis of the complexes and their parent nitrogen ligands were scanned, the results indicated that the hydrolysis rates of BNPP were 4.5 × 104 and 6.2 × 105 for (1) and (2), respectively. In addition, anti-bacterial activities were scanned to investigate the effect of complexation on their activity against Gram-positive (S. epidermidis, S. aureus, E. faecalis, M. luteus and B. Subtilis) and Gram-negative (K. pneumonia, E. coli, P. Mirabilis and P. Aeruginosa) bacteria using agar well-diffusion method. Complex 1 showed high activity against G−and G+ bacteria except against E. faecalis and P. Aeruginosa. Complex 2 did not show any activity against G− or G+ bacteria.This work reports the synthesis and characterization of new mixed ligand Zn(II) complexes based on the biologically active substituted acetic acid and nitrogen donor ligands. The crystal structures of complexes 1 and 2 were determined using single-crystal X-ray diffraction. In-vitro anti-bacterial activity of the prepared complexes and their parent ligands were investigated against different Gram-positive and Gram-negative bacteria using agar diffusion method. BNPP hydrolysis of the complexes and their parent nitrogen ligands were determined.
      PubDate: 2017-04-27T12:46:14.848631-05:
      DOI: 10.1002/aoc.3829
       
  • Copper immobilized on magnetite nanoparticles coated with ascorbic acid:
           An efficient and reusable catalyst for C─N and C─O cross-coupling
           reactions
    • Authors: Abdol R. Hajipour; Maryam Check, Zahra Khorsandi
      Abstract: In a continuation of using magnetic nanoparticle (MNP)-supported catalysts, ascorbic acid (readily available, very safe and with strong affinity to MNPs) was used instead of the commonly used silica layer coating. This hybrid was used for immobilizing copper nanoparticles to produce Cu/ascorbic acid@MNPs catalyst. The catalyst was characterized and used in carbon–oxygen and carbon–nitrogen (various substrates) cross-coupling reactions in aqueous media and at room temperature with excellent product yields. Furthermore, the catalyst could be quickly and completely recovered using an external magnetic field and reused for six reaction cycles without significant change in catalytic activity.Coating of magnetic Fe3O4 nanoparticles with ascorbic acid, as safe and available compound, was reported for the first time which used for immobilization of copper particles and prevention the MNPs aggregation. This new and efficient magnetic copper (I) nanocatalyst was employed in C-N and C-O coupling reactions in water and room temperature conditions.
      PubDate: 2017-04-27T12:37:21.575953-05:
      DOI: 10.1002/aoc.3769
       
  • Pyrazine based Pt(II) bis-alkynyl organometallic complexes: Synthesis,
           
    • Authors: Sourav Bhowmick; Achintya Jana, Subba R. Marri, Prerak Gupta, J.N. Behera, Biman B. Mandal, Neeladri Das
      Abstract: A facile and efficient synthesis of a series of five new pyrazine-based organometallic complexes is being reported. The complexes (2–6) have been fully characterized. Molecules 2, 3 and 6 were structurally characterized by single crystal X-ray crystallographic analyses. Additionally, anticancer properties of these organometallic complexes have been studied against A549 human lung carcinoma cells. Biological studies suggest that complex 5 (with pendant pyridine moieties) exhibited maximal growth inhibitory cytotoxic effect even at lower concentration (nearly 0.5–1 μM) whereas the other four compounds (2, 3, 4 and 6) were non-toxic below 1 μM concentration. Two complexes (4 and 6) were effective only at higher doses (approx 30 μM) while the remaining two organometallic complexes (2 and 3) were able to inhibit 50% cell growth at slightly lower concentration (nearly 10 μM). As far as IC50 is concerned, 5 exhibited a minimum value ranging between 3–5 μM which is comparable with cisplatin under similar conditions.Five new pyrazine-based organometallic complexes containing a pyrazine ring in the center and have two Pt(II)-alkynyl branches protruding on either side have been synthesized. These pyrazine-containing and π-conjugated Pt(II)-alkynyl complexes are quite rare. For the first time, these organometallic complexes have shown a potential application: cytotoxic potency against A549 human lung carcinoma cells
      PubDate: 2017-04-27T12:37:15.202856-05:
      DOI: 10.1002/aoc.3824
       
  • Preparation of choline chloride–urea deep eutectic solvent-modified
           magnetic nanoparticles for synthesis of various 2-amino-4H-pyran
           derivatives in water solution
    • Authors: Hossein Tavakol; Fariba Keshavarzipour
      Abstract: A novel hybrid magnetic nanocatalyst was synthesized by covalent coating of Fe3O4 magnetic nanoparticles with choline chloride–urea deep eutectic solvent using 3-iodopropyltrimethoxysilane as a linker. The structure of this new catalyst was fully characterized via elemental analysis, transmission and scanning electron microscopies, X-ray diffraction and Fourier transform infrared spectroscopy. It was employed in the synthesis of various 2-amino-4H-pyran derivatives in water solution via an easy and green procedure. The desired products were obtained in high yields via a three-component reaction between aromatic aldehyde, enolizable carbonyl and malononitrile at room temperature. The employed nanocatalyst was easily recovered using a magnetic field and reused four times (in subsequent runs) with less than 8% decrease in its catalytic activity.A novel hybrid nanocatalyst was prepared by covalent coating of magnetite nanoparticles with choline chloride–urea deep eutectic solvent. It was employed in the synthesis of various 2-amino-4H-pyran derivatives in water solution via an easy and green procedure.
      PubDate: 2017-04-27T12:24:38.509248-05:
      DOI: 10.1002/aoc.3811
       
  • Covalent supporting of novel dioxo-molybdenum tetradentate pyrrole-imine
           complex on Fe3O4 as high-efficiency nanocatalyst for selective epoxidation
           of olefins
    • Authors: Shadab Akbarpour; Abolfazl Bezaatpour, Elham Askarizadeh, Mandana Amiri
      Abstract: A novel Mo(VI) tetradentate Schiff base complex based on two pyrrole-imine donors was anchored covalently on Fe3O4 nanoparticles and characterized using physicochemical techniques. The catalytic epoxidation process was optimized in terms of the effects of solvent, reaction temperature, kind of oxidant and amount of oxidant and catalyst. Then the novel heterogeneous nanocatalyst was used for the efficient and selective catalytic epoxidation of internal alkenes (cyclohexene, cyclooctene, α-pinene, indene and trans-1,2-diphenylethene) and terminal alkenes (n-heptene, n-octene, n-dodecene and styrene) using tert-butyl hydroperoxide (70% in water) as oxidant in 1,2-dichloroethane as solvent. The prepared nanocatalyst is very effective for the selective epoxidation of cis-cyclooctene with 100% conversion, 100% selectivity and turnover frequency of 1098 h−1 in just 30 min. The magnetic nanocatalyst was easily recovered using an external magnetic field and was used subsequently at least six times without significant decrease in conversion.High-efficiency nanocatalyst for selective epoxidation of olefins with 100% conversion and 100% selectivity in 30 min. Novel dioxo-molybdenum tetradentate pyrrole-imine Schiff base complex. Synthesis of recoverable environmentally friendly catalyst system.
      PubDate: 2017-04-27T12:20:48.144725-05:
      DOI: 10.1002/aoc.3804
       
  • Synthesis, structure and in vitro anticancer, DNA binding and cleavage
           activity of palladium (II) complexes based on isatin thiosemicarbazone
           derivatives
    • Authors: Amna Qasem Ali; Siang Guan Teoh, Naser Eltaher Eltayeb, Mohamed B. Khadeer Ahamed, A.M.S. Abdul Majid, Arabya A.A. Almutaleb
      Abstract: Six novel palladium(II) complexes of a thiosemicarbazone Schiff base with isatin moiety (PdL1 to PdL6) were synthesized by the reaction of palladium(II) with the following: (Z)-2-(2-oxoindolin-3-ylidene)-N-phenylhydrazinecarbothioamide (L1H), (Z)-2-(5-methyl-2-oxoindolin-3-ylidene)-N-phenylhydrazinecarbothioamide (L2H), (Z)-2-(5-fluoro-2-oxoindolin-3-ylidene)-N-phenylhydrazinecarbothioamide (L3H), (Z)-N-methyl-2-(5-nitro-2-oxoindolin-3-ylidene)hydrazinecarbothioamide (L4H), (Z)-N-methyl-2-(5-methyl-2-oxoindolin-3-ylidene)hydrazinecarbothioamide (L5H) and (Z)-N-ethyl-2-(5-methyl-2-oxoindolin-3-ylidene)hydrazinecarbothioamide (L6H). The structures of these complexes were characterized using elemental analysis and infrared, UV–visible, 1H NMR and mass spectroscopies. The structure of PdL5 was further characterized using single-crystal X-ray diffraction. The interaction of these complexes with calf thymus DNA was characterized with a high intrinsic binding constant (Kb = 5.78 × 104 to 1.79 × 106 M−1), which reflected the intercalative activity of these complexes towards calf thymus DNA. This result was also confirmed from viscosity data. Electrophoresis studies revealed that complexes PdL1 to PdL6 could cleave DNA via an oxidative pathway in the presence of an external agent. Data obtained from an in vitro anti-proliferative study clearly established the anticancer potency of these compounds against the human colorectal carcinoma cell line HCT 116.Pd(II) complexes of isatin thiosemicarbazone derivatives were prepared and examined for their anticancer activity against human colorectal (HCT 116) cell line as well as for their binding and cleavage activities. All the complexes exhibited a clear anticancer potency. The complexes exhibited a high intrinsic binding constant and could cleave DNA via an oxidative pathway.
      PubDate: 2017-04-27T12:13:27.832568-05:
      DOI: 10.1002/aoc.3813
       
  • Facile synthesis of magnetic hybrid metal–organic frameworks with high
           adsorption capacity for methylene blue
    • Authors: Rui Wang; Chunhua Ge, Tianzhu Xing, Yuanyuan Zhang, Yundi Zhang, Xiangdong Zhang
      Abstract: A magnetic hybrid material (Fe3O4-COOH/HKUST-1) was easily synthesized via a two-step simple solvothermal method. Through adding sodium acrylate directly into the synthesis of Fe3O4 spheres, the surface has more carboxyl groups. It is notable that the reactions proceed without use of organic surfactants. The magnetic hybrid material was characterized using various techniques. The magnetic hybrid material has a high specific surface area (430.15 m2 g−1) and excellent magnetism (23.65 emu g−1). It is an efficient adsorbent for removing organic dyes like methylene blue (MB) from aqueous solution. It also can be easily recovered from liquid media using an external magnetic field. Adsorption experiment shows the magnetic hybrid material possesses a high adsorption capacity (118.6 mg g−1), and has high adsorption efficiency (94.3%) after five adsorption cycles with ethanol (0.2% HCl) as eluent. The sorption kinetics and isotherm analysis indicate these sorption processes are better fitted to the pseudo-second-order and Langmuir equations. Thermodynamic study shows the sorption processes are spontaneous and endothermic.A magnetic hybrid material (Fe3O4-COOH/HKUST-1) was easily synthesized via a two-step simple solvothermal method. The magnetic hybrid material has a high specific surface area and excellent magnetism and it is an efficient adsorbent for removing organic dyes like methylene blue (MB) from aqueous solution.
      PubDate: 2017-04-26T02:26:02.075397-05:
      DOI: 10.1002/aoc.3798
       
  • An easily organic–inorganic hybrid optical sensor based on dithizone
           impregnation on mesoporous SBA-15 for simultaneous detection and removal
           of Pb(II) ions from water samples: Response-surface methodology
    • Authors: Kheibar Dashtian; Rouholah Zare-Dorabei
      Abstract: In this study, a novel organic–inorganic hybrid adsorbent for single-step detection and removal of Pb(II) ions based on dithizone (DZ) anchored on mesoporous SBA-15 was fabricated. The designed solid optical sensor revealed rapid colorimetric responses and high selectivity. Central composite design (CCD) combined with desirability function (DF) was applied to evaluate the interactive effects and optimization of important variables such as pH value, mesoporous SBA-15 dosage, contact time and initial concentration of Pb(II) ions and optimum conditions for each of the factors were obtained 6.0, 25 mg, 30 min and 20 μg ml− 1, respectively. This adsorbent or solid optical chemo sensor exhibited a linear range of 1.0 to 100.0 μg ml−1 of Pb(II) ion concentration with a detection limit of 0.07 μg ml−1. This adsorbent was applied to determine and remove the Pb(II) in spiked samples. Various isotherm models such as Langmuir, Freundlich, Temkin and Dubinin–Radushkevich were studied for fitting the experimental equilibrium data. Langmuir model was chosen as an efficient model. Various kinetic models such as pseudo-first, second order intraparticle, diffusion models were studied for analysis of experimental adsorption data and the pseudo second order model was chosen as an efficient model.A novel organic–inorganic hybrid adsorbent for single-step detection and removal of Pb(II) ions based on dithizone (DZ) anchored on mesoporous SBA-15 was fabricated. The designed solid optical sensor revealed rapid colorimetric responses and high selectivity.
      PubDate: 2017-04-26T02:25:48.18757-05:0
      DOI: 10.1002/aoc.3842
       
  • Preparation and characterization of copper chloride supported on citric
           acid-modified magnetite nanoparticles (Cu2+-CA@Fe3O4) and evaluation of
           its catalytic activity in the reduction of nitroarene compounds
    • Authors: Ehsan Ghonchepour; Elahe Yazdani, Dariush Saberi, Marzban Arefi, Akbar Heydari
      Abstract: A new, powerful and recyclable copper catalyst were prepared by heterogenization of copper chloride using of Fe3O4 nano particles modified with citric acid as a linker. This system can catalyze reduction of nitroaren compound to aniline derivatives in the presence of Sodium borohydride as a reduction agent in moderate to good yields. In addition, easy separation and recoverable with an external permanent magnet is the dominant properties of this catalyst (Cu2+-CA@Fe3O4).Synthesis of green green power copper catalyst.Heterogenization of copper chloride using of Fe3O4 Nano particles modified with citric acid as linker.Efficient reduction of nitroaren compound to aniline derivatives.Easy separation and recoverable with an external permanent.
      PubDate: 2017-04-26T02:21:17.763482-05:
      DOI: 10.1002/aoc.3822
       
  • Palladium(II) complexes of aminothiazole-based phosphines: Synthesis,
           structural characterization, density functional theory calculations and
           catalytic application in heck reaction
    • Authors: Khodayar Gholivand; Mohammad Kahnouji, S. Mark Roe, Akram Gholami, Farzaneh T. Fadaei
      Abstract: Three Pd(II) complexes of some hemilabile ligands, aminothiazole-based phosphines, were synthesized to investigate the catalytic activity of them in Heck cross-coupling reactions. The crystal structures of complexes PdCl2[(Ph2P)HN(C3H2NS)] (C1) and PdCl2[(Ph2P)HN(C7H4NS)] (C3) were determined using X-ray crystallography, which reveals that the ligand coordinates in a chelating mode through P and N (endocyclic) atoms in square planar geometry. Experimental and theoretical studies (atoms in molecules and natural bond orbital analyses) show that the Pd(II) interacts more strongly with the P atom than the N atom in the chelated ligand, N^P. This trait can promote catalytic activity of the complexes in comparison with our previous work in which chelated ligands with two phosphorus atoms, P^P, were used. The influence of non-covalent intermolecular interactions on the assembly of the solid-state structures is also discussed in terms of geometrical analysis. The prepared complexes turn out to be useful pre-catalysts in Heck cross-coupling reactions owing to the coordinative flexibility of the hemilabile ligands. The protocol affords the corresponding products in greater yield than the same reactions with bis(phosphino)amine Pd(II) complexes, as the catalysts in our previous work.Synthesis of three Pd(II) complexes with some aminothiazole-based phosphines. Molecular structure and crystal packing of the complexes were investigated. They represent high catalytic activity in the Heck coupling reactions owing to the coordinative flexibility of the hemilabile ligand.
      PubDate: 2017-04-26T02:16:49.863736-05:
      DOI: 10.1002/aoc.3793
       
  • Palladium-catalyzed cyclocarbonylation of cyclic diaryliodoniums:
           Synthesis of fluorenones
    • Authors: Li Liu; Jian Qiang, Shuhua Bai, Yang Li, Chunbao Miao, Jian Li
      Abstract: An efficient approach to the synthesis of fluorenones via the palladium-catalyzed cyclocarbonylation of cyclic diaryliodoniums was developed. Our route enables facile access to fluorenones with various substituents in modest to high yields.A direct route to fluorenones by palladium-catalyzed cyclocarbonylation of cyclic diaryliodoniums with CO was developed in high yields. In addition, one pot strategy was developed from 1-(2-iodophenyl)-1H-indole to syntheses indole fluorenones in modest yields via the formation of cyclic diaryliodoniums.
      PubDate: 2017-04-26T02:16:34.70951-05:0
      DOI: 10.1002/aoc.3817
       
  • Iron-catalyzed carbon–sulfur bond formation: Atom-economic construction
           of thioethers with diaryliodonium salts
    • Authors: Li Liu; Jian Qiang, Shuhua Bai, Yang Li, Jian Li
      Abstract: Diaryliodonium salts are characterized by poor atom economy with the formation of one equivalent of an iodoarene as waste. We have developed an atom-economic iron-catalyzed protocol for the synthesis of a variety of thioethers with diaryliodonium salts. Not only cyclic diaryliodonium salts but also linear diaryliodonium salts were found to perform well in the reactions.An atom economic iron-catalyzed protocol for the synthesis of a variety of thioethers with diaryliodonium salts was developed. Not only cyclic diaryliodonium salts but also linear diaryliodonium salts were found to perform well in the reactions.
      PubDate: 2017-04-26T02:16:33.28582-05:0
      DOI: 10.1002/aoc.3810
       
  • Synthesis, characterization and cytotoxicity of platinum(II) complexes
           containing reduced amino acid ester Schiff bases
    • Authors: Qin-Qin Yan; Zhen Yuan, Guo-Jun Liu, Zheng-Hua Lv, Bin Fu, Jian-Long Du, Li-Jun Li
      Abstract: Nine platinum(II) complexes containing reduced amino acid ester Schiff bases were synthesized and characterized using spectroscopy (1H NMR, 13C NMR, infrared), elemental analysis and molar conductivity. The interaction of these complexes with salmon sperm DNA was investigated by means of ultraviolet and circular dichroism spectroscopies. The potential antitumor activity of all compounds was tested in vitro on HeLa and A549 tumor cell lines. Almost all the complexes exhibited better cytotoxic activity than cisplatin against these cell lines.The binding mode of complexes with DNA is of intercalation type from CD spectra, and most complexes exhibited higher cytotoxic activity than cisplatin.
      PubDate: 2016-12-13T01:45:33.304247-05:
      DOI: 10.1002/aoc.3689
       
  • Functionalized graphene oxide supported copper (I) complex as effective
           and recyclable nanocatalyst for one-pot three component synthesis of
           1,2,3-triazoles
    • Authors: Hossein Naeimi; Rahele Shaabani, Mohsen Moradian
      Abstract: Efficient, one pot three-component reaction of alkyl halides, sodium azide with terminal alkynes can be catalyzed by functionalized graphene oxide with copper(I) under thermal conditions. A series of 1,4-disubstituted 1,2,3-triazoles were obtained by this one-pot strategy. The catalyst was prepared and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray (EDX). The catalyst can be reused at least five times without significant deactivation.A one-pot procedure for synthesis of 1,2,3-triazole derivatives via the three-component coupling reaction between alkyl halides, sodium azide with terminal alkynes in the presences of GO-NH-IA-Cu (I) catalyst has been developed.
      PubDate: 2016-10-19T22:55:32.520142-05:
      DOI: 10.1002/aoc.3626
       
  • Suzuki and Heck cross-coupling reactions using ferromagnetic
           nanoparticle-supported palladium complex as an efficient and recyclable
           heterogeneous nanocatalyst in sodium dodecylsulfate micelles
    • Authors: Kiumars Bahrami; Mohammad M. Khodaei, Farhat Sadat Meibodi
      Abstract: A novel heterogeneous Pd catalyst was synthesized by anchoring Pd(II) onto 4′-(4-hydroxyphenyl)-2,2′:6′,2″-terpyridine-coated Fe3O4 (FMNPs@TPy-Pd). This catalyst has been demonstrated for the first time as a recoverable and reusable heterogeneous nanocatalyst in Suzuki and Heck cross-coupling reactions. The catalyst is very easy to handle and is environmentally safe and economical. FMNPs@TPy-Pd was characterized using transmission and scanning electron microscopies, X-ray diffraction, and Fourier transform infrared and energy-dispersive X-ray spectroscopies.A novel heterogeneous Pd catalyst was synthesized by anchoring Pd(II) onto 4′-(4-hydroxyphenyl)-2,2′:6′,2″-terpyridine-coated Fe3O4 (FMNPs@TPy-Pd). This catalyst was demonstrated for the first time as a recoverable and reusable heterogeneous nanocatalyst in Suzuki and Heck cross-coupling reactions. The catalyst is very easy to handle and is environmentally safe and economical. FMNPs@TPy-Pd was characterized using various methods.
      PubDate: 2016-10-19T22:55:27.70892-05:0
      DOI: 10.1002/aoc.3627
       
  • Palladium-catalyzed highly selective intramolecular bromoamination of
           alkenes: Efficient synthesis of substituted pyrrolidines
    • Authors: Jingfang Zhang; Xie Wang, Yulong Liu, Xiaoyun Wang, Wei He
      Abstract: A new method has been developed for the preparation of substituted pyrrolidines by the palladium-catalyzed intramolecular bromoamination of substituted aminoalkenes. The catalytic system and reaction conditions used for this transformation have been fully optimized. Notably, this reaction exhibits excellent selectivity, affording the pyrrolidine products as single 5-exo-bromoalkylpyrrolidines in excellent yields. Furthermore, this reaction occurs at room temperature under mild conditions, reaching completion within 1 h.The reaction of Pd-catalyzed intramolecular bromoamination of substituted alkenes has been developed. The expected bromoamination products are obtained in up to 98% yield under the conditions of 10% Pd(PPh3)2Cl2, K2CO3 (2 eq.), N-bromosuccinimide (NBS; 1.5 eq.) and CH2Cl2, and the reaction time is within 1 h.
      PubDate: 2016-10-11T05:00:44.962902-05:
      DOI: 10.1002/aoc.3631
       
  • Synthesis and structural characterization of new bioactive ligands and
           their Bi(III) derivatives
    • Authors: Ahmad Raheel; Imtiaz-ud-Din, Sohaila Andleeb, Simko Ramadan, Muhammad Nawaz Tahir
      Abstract: Five new carboxylic acid precursors bearing thiourea group and their corresponding bismuth(III) complexes were synthesized and characterized using CHNS and inductively coupled plasma analyses and infrared and NMR (1H, 13C) spectroscopies. Single-crystal X-ray diffraction analysis was also carried out for one of the precursors. The behaviour of the compounds was bioassayed for antibacterial, antifungal, antioxidant and enzyme (lipoxygenase, α-glycosidase and anti-urease) inhibition activities. It is concluded that the interaction of the compounds with bismuth enhances both the antimicrobial and enzyme inhibition activities. The synthesized compounds may prove to be good therapeutic agents.Five new pivaloylcarbamothioyl amino acids and their corresponding bismuth(III) derivatives were synthesized and characterized using sophisticated techniques. The behaviour of the compounds was bioassayed for antibacterial, antifungal, antioxidant and enzyme (lipoxygenase, α-glycosidase and anti-urease) inhibition activities.
      PubDate: 2016-10-11T05:00:32.156805-05:
      DOI: 10.1002/aoc.3632
       
  • Synthesis, structure and antiproliferative activity of organometallic
           iridium(III) complexes containing thiosemicarbazone ligands
    • Authors: Wei Su; Binghua Peng, Peiyuan Li, Qi Xiao, Shan Huang, Yunqiong Gu, Zefeng Lai
      Abstract: A series of half-sandwich iridium complexes (1–4) with thiosemicarbazone ligands in two types of coordination modes were synthesized and characterized. The molecular structures of compounds 1, 2 and 3 were determined using single-crystal X-ray diffraction analysis. The nature of the complexes was studied using density functional theory calculations. The stability of the complexes was investigated using UV–visible absorption spectroscopy. The compounds were further evaluated for their in vitro antiproliferative activities against HeLa, HepG2, CNE-2, SGC-7901, KB and HEK-293 T cell lines. Compound 2 displays the highest antiproliferative activity among the other analogues and cisplatin.The formations of iridium–arene complexes derived from thiosemicarbazone ligands are reported. The molecular structures of the complexes were determined using single-crystal X-ray diffraction analysis. The cytotoxicity of these compounds towards HeLa cervical carcinoma, HepG2 liver carcinoma, CNE-2 nasopharyngeal carcinoma, SGC-7901 gastric carcinoma, KB oral epithelial carcinoma and HEK-293 T embryonic kidney cell lines was investigated.
      PubDate: 2016-10-11T04:40:46.028898-05:
      DOI: 10.1002/aoc.3610
       
  • Greener approach for synthesis of monodispersed palladium nanoparticles
           using aqueous extract of green tea and their catalytic activity for the
           Suzuki–Miyaura coupling reaction and the reduction of nitroarenes
    • Authors: Hojat Veisi; Amin Rostami, Mohadeseh Shirinbayan
      Abstract: A facile and green route for the synthesis of palladium nanoparticles (NPs) was developed utilizing non-toxic and renewable natural green tea extract as the reducing, stabilizing and capping agent. The as-prepared Pd-NPs@G.Tea extract was characterized using UV–visible spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The Pd-NPs@G.Tea extract could be used as an efficient and heterogeneous catalyst for Suzuki coupling reactions between phenylboronic acid and a range of aryl halides containing iodo, bromo and chloro moieties, and also for the reduction of nitroarenes using sodium borohydride in an environmentally friendly medium. Excellent yields of products were obtained with a wide range of substrates and the catalyst was recycled multiple times without any significant loss of its catalytic activity.A facile and green route for the synthesis of palladium nanoparticles (Pd NPs) was developed utilizing non-toxic and renewable natural green tea extract as the reducing, stabilizing and capping agent.
      PubDate: 2016-10-11T04:31:28.990578-05:
      DOI: 10.1002/aoc.3609
       
  • Effect of fluorinated/non-fluorinated β-diketones and side-chain
           branching of N-protected amino acids on the antibacterial potential of new
           heptacoordinated monobutyltin(IV) complexes
    • Authors: Karuna Maheshwari; Manish Kumar Srivastava, Sanjiv Saxena, Asha Jain
      Abstract: The effect of fluorinated/non-fluorinated β-diketones and side-chain branching of N-protected amino acids on the antibacterial potential of new heptacoordinated monobutyltin(IV) complexes was investigated. New heptacoordinated monobutyltin(IV) complexes having the general formulae BuSn(A)2B and BuSnA(B)2 [where AH = (1,3-dihydro-1,3-dioxo-α-(substituted)-2H-isoindole-2-acetic acids, N-protected amino acids), R = CH(CH3)CH2CH3: A1H; R = CH(CH3)2: A2H; and BH = R'COCH2COR″ (β-diketones), R′ = R″ = CH3: B1H; R′ = CH3, R″ = C6H5: B2H; R′ = CF3, R″ = C6H5: B3H] were synthesized. Complexes BuSn(A)2B and BuSnA(B)2 were generated by the reaction of sodium salts of the ligands AH and BH with BuSnCl3 in 2:1:1 and 1:2:1 molar ratios, respectively. These newly generated complexes were characterized in physicochemical and spectroscopic studies. These complexes contain heptacoordinated tin centres as revealed by 119Sn NMR chemical shift values. Some of the newly generated complexes and their corresponding ligands were screened for their antibacterial activity to study the structure–activity relationship.Heptacoordinated complexes of the type BuSn(A)2B and BuSnA(B)2 were synthesized. The effect of fluorinated/non-fluorinated β-diketones and side-chain branching of N-protected amino acids on the antibacterial potential of these complexes was investigated.
      PubDate: 2016-10-06T00:15:53.890873-05:
      DOI: 10.1002/aoc.3628
       
  • Heteroleptic Schiff base complexes containing terpyridine as chemical
           nucleases and their biological potential: A study of DNA binding and
           cleaving, antimicrobial and cytotoxic tendencies
    • Authors: Ponnukalai Ponya Utthra; Ganesan Kumaravel, Raju Senthilkumar, Natarajan Raman
      Abstract: Amidst the very many metallodrugs for the treatment of cancer regularly reported, the development of the next generation of compounds with an aim of overcoming the shortcomings by enhancing biological activity and cytotoxicity but exhibiting low toxicity is essential. Herein we report such octahedral metal(II) complexes (1–12) containing triazole-derived Schiff base as the scaffold. The complexes were synthesized and characterized by means of elemental analysis and various spectroscopic techniques. The complexes were subjected to various investigations that involved their interaction with calf thymus DNA and supercoiled pBR322 DNA. In vitro antimicrobial studies were also conducted in addition to the use of spectrophotometric, spectrofluorometric, cyclic voltammetric and hydrodynamic techniques. Although all complexes showed activity, complex 9 revealed excellent DNA proclivity, DNA cleaving tendencies and antimicrobial efficacy. All copper(II) complexes were evaluated for their antiproliferative activity against a panel of human cancer cell lines (HeLa, Hep-2, MCF-7 and NHDF). Complexes 1–12 showed activity against all the cell lines with low toxicity towards normal cell line, and the activity of complex 9 towards Hep-2 was prominent. The effect of the ligand system on the complexes is also discussed along with the importance of tuning the ligand system.Twelve octahedral Schiff base complexes exhibit DNA interactions and are good metallointercalators. The complexes manifested as excellent antimicrobial agents, chemical nucleases and anticancer agents. The Cu(II) complex with chloroterpyridine in its environment shows the best activity.
      PubDate: 2016-10-06T00:11:37.623045-05:
      DOI: 10.1002/aoc.3629
       
  • Application of a biological-based nanomagnetic catalyst in the synthesis
           of bis-pyrazols and pyrano[3,2-c]pyrazoles
    • Authors: Mohammad Ali Zolfigol; Mahdiyeh Navazeni, Meysam Yarie, Roya Ayazi-Nasrabadi
      Abstract: {Fe3O4@SiO2@(CH2)3-thiourea dioxide-SO3H/HCl}, a newly reported nanomagnetic core–shell supported solid acid catalyst, was successfully employed in the preparation of 4,4′-(arylmethylene)bis(1H–pyrazol-5-ol) and pyrano[3,2-c]pyrazole derivatives. The presented methods are very efficient and high-yielding. Also, the catalyst exhibited powerful potential for reusability in both types of reactions.{Fe3O4@SiO2@(CH2)3-thiourea dioxide-SO3H/HCl}, a newly reported nanomagnetic core–shell supported solid acid catalyst, was successfully employed in the preparation of 4,4′-(arylmethylene)bis(1H–pyrazol-5-ol) and pyrano[3,2-c]pyrazole derivatives. The presented methods are very efficient and high-yielding. Also, the catalyst exhibited reusability in both reactions.
      PubDate: 2016-10-06T00:11:31.771667-05:
      DOI: 10.1002/aoc.3633
       
  • Au- and Ag-loaded MnO2 nanostructures supported on nitrogen- and
           nitrogen–sulfur-doped pyroproteins: Synthesis and catalytic activity in
           organic transformations
    • Authors: Zeinab Hezarkhani; Ahmad Shaabani
      Abstract: Four novel Au- and Ag-loaded MnO2 nanostructures supported on nitrogen-doped pyroprotein of natural silk (Au–MnO2@PPNS and Ag–MnO2@PPNS) and nitrogen–sulfur-doped pyroprotein of natural wool (Au–MnO2@PPNW and Ag–MnO2@PPNW) have been synthesized. Nitrogen- and nitrogen–sulfur-doped pyroproteins were prepared by carbonization of natural silk and wool proteins, respectively. The catalysts were investigated for the aerobic oxidation of aromatic hydrocarbons of petroleum naphtha and the aerobic oxidative synthesis of 2-phenylbenzo[d]thiazoles, 2-phenyl-1H-benzo[d]imidazoles and 2-phenyl-4-quinazolinones in the absence of any co-promoter and additional oxidizing reagent. The prepared catalytic systems showed higher catalytic activity in comparison to aggregated catalysts.Nitrogen- and nitrogen–sulfur-doped pyroproteins were prepared by carbonization of natural silk and wool proteins, respectively. Au- and Ag-loaded MnO2 nanostructures were supported on these pyroproteins. The prepared catalysts were used for the aerobic oxidation of aromatic hydrocarbons of petroleum naphtha and the aerobic oxidative synthesis of 2-phenylbenzo[d]thiazoles, 2-phenyl-1H-benzo[d]imidazoles and 2-phenyl-4-quinazolinones.
      PubDate: 2016-10-06T00:06:43.60414-05:0
      DOI: 10.1002/aoc.3624
       
  • Effect of weak base modification on ZSM-5 catalyst for methanol to
           aromatics
    • Authors: Wei Feng; Xiaofeng Gao, Chuanmin Ding, Yanming Jia, Junwen Wang, Kan Zhang, Ping Liu
      Abstract: The effect of weak base modification on the catalytic performance of ZSM-5 catalyst for conversion of methanol to aromatics was investigated. The catalysts were characterized using X-ray diffraction, X-ray fluorescence, N2 adsorption–desorption, NH3 temperature-programmed desorption, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetry. The results showed that catalysts treated with weak base (NaHCO3, Na2CO3 and NH3⋅H2O) exhibited a pore structure with interconnected micropores and mesopores. The existence of mesopores was beneficial for improving the diffusion of reactants and products, and the coke deposition resistance capacity of treated catalysts was enhanced greatly. Meanwhile, compared to traditional ZSM-5 zeolite, the ratio of Brønsted to Lewis (B/L) acid sites of ZSM-5/NH3⋅H2O (B/L = 7.35) zeolite slightly increased but the amount of acid sites reduced, while those of ZSM-5/NaHCO3 (B/L = 0.127) and ZSM-5/Na2CO3 (B/L = 0.107) significantly reduced. Further, the catalyst treated with NH3⋅H2O solution was evaluated in the methanol to aromatics reaction and led to an enhanced aromatization reaction rate. The liquid hydrocarbons product distribution exhibited higher aromatic hydrocarbons yield (56.12%) and selectivity (40.28%) of benzene, toluene and xylene (BTX) with isoparaffin content reducing to 26.17%, which could be explained by appropriate B/L acid sites ratio, higher pore volumes and higher surface area.A high ratio of Brønsted to Lewis acid sites is favorable for the production of aromatic products.
      PubDate: 2016-10-06T00:06:18.37973-05:0
      DOI: 10.1002/aoc.3625
       
  • Preparation and in vitro investigations of
           triphenyl[ω-(tetrahydro-2H-pyran-2-yloxy)alkyl]tin(IV) compounds
    • Authors: David Edeler; Christian Bensing, Harry Schmidt, Goran N. Kaluđerović
      Abstract: The reaction of SnPh3Li with X(CH2)nO–THP (THP = tetrahydro-2H-pyran-2-yl; n = 3, 4, 6, 8, 11; X = Cl, Br) afforded organotin(IV) compounds with the general formula Ph3Sn(CH2)nO–THP (1–5). The tetraorganotin(IV) compounds were characterized using multinuclear NMR and infrared spectroscopies and high-resolution mass spectrometry. Anticancer activity of the synthesized compounds was tested in vitro against the A2780 (ovarian), A549 (lung), HeLa (adenocarcinoma) and SW480 (colon) tumour cell lines with SRB assay. The in vitro investigations revealed that when a shorter chain was present a higher activity was achieved; however compounds 1–5 were found to be less active than cisplatin. In addition, the most active compound, 1, enters A2780 cells and causes apoptosis by triggering both intrinsic and extrinsic caspase pathways.Preparation and characterization of five new organotin(IV) compounds, as well as their anticancer activity against four cell lines, are reported. The most active compound enters A2780 cells and causes apoptosis by triggering both intrinsic and extrinsic caspase pathways.
      PubDate: 2016-10-04T03:52:24.325994-05:
      DOI: 10.1002/aoc.3630
       
  • Oxidation of alkenes catalysed by molybdenum(VI)–oxodiperoxo complex
           anchored on the surface of magnetic nanoparticles under solvent-free
           conditions
    • Authors: Maryam Zare; Zeinab Moradi-Shoeili
      Abstract: A new epoxidation catalyst has been prepared by grafting a molybdenum(VI)–oxodiperoxo complex containing an oxazine ligand, [MoO(O2)2(phox)], on chloro-functionalized Fe3O4 nanoparticles. The synthesized heterogeneous catalyst (MoO(O2)2(phox)/Fe3O4 was characterized using powder X-ray diffraction, scanning and transmission electron microscopies, vibrating sample magnetometry, energy-dispersive X-ray analysis, Fourier transform infrared spectroscopy and inductively coupled plasma atomic emission spectroscopy. The immobilized complex gave high product yields and high selectivity for epoxide compared to the corresponding homogeneous one in the epoxidation of various olefins in the presence of tert-butyl hydroperoxide at 95°C without any co-solvent. Also, the heterogeneous catalyst can be recycled without a noticeable change in activity and selectivity.A catalyst of modified Fe3O4 nanoparticles as support for a molybdenum(VI) oxodiperoxo complex containing an oxazine ligand shows high catalytic activity and selectivity under solvent-free conditions, as does the homogeneous conterpart.
      PubDate: 2016-10-03T04:21:31.685855-05:
      DOI: 10.1002/aoc.3611
       
 
 
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