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    - CHEMISTRY (539 journals)
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CHEMISTRY (539 journals)                  1 2 3 4 5 6 | Last

2D Materials     Hybrid Journal   (Followers: 3)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 31)
ACS Catalysis     Full-text available via subscription   (Followers: 24)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 13)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 8)
ACS Macro Letters     Full-text available via subscription   (Followers: 17)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 25)
ACS Nano     Full-text available via subscription   (Followers: 270)
ACS Photonics     Full-text available via subscription   (Followers: 2)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 8)
Acta Chemica Iasi     Open Access  
Acta Chimica Sinica     Full-text available via subscription  
Acta Chimica Slovaca     Open Access   (Followers: 6)
Acta Chromatographica     Full-text available via subscription   (Followers: 10)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 4)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 3)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 4)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 8)
Advanced Functional Materials     Hybrid Journal   (Followers: 34)
Advances in Chemical Engineering and Science     Open Access   (Followers: 21)
Advances in Chemical Science     Open Access   (Followers: 8)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 13)
Advances in Drug Research     Full-text available via subscription   (Followers: 17)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 12)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 13)
Advances in Nanoparticles     Open Access   (Followers: 11)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Polymer Science     Hybrid Journal   (Followers: 38)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 10)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 4)
African Journal of Chemical Education     Open Access   (Followers: 1)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 4)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alchemy     Open Access   (Followers: 3)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 4)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 169)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 11)
American Journal of Chemistry     Open Access   (Followers: 17)
American Journal of Plant Physiology     Open Access   (Followers: 10)
American Mineralogist     Full-text available via subscription   (Followers: 2)
Analyst     Full-text available via subscription   (Followers: 35)
Angewandte Chemie     Hybrid Journal   (Followers: 16)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 214)
Annales UMCS, Chemia     Open Access   (Followers: 2)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 1)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 2)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 10)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 12)
Anti-Infective Agents     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 12)
Applied Surface Science     Hybrid Journal   (Followers: 14)
Arabian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 4)
Autophagy     Full-text available via subscription   (Followers: 1)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 6)
Biochemistry     Full-text available via subscription   (Followers: 205)
Biochemistry Insights     Open Access   (Followers: 4)
Biochemistry Research International     Open Access   (Followers: 4)
BioChip Journal     Hybrid Journal   (Followers: 1)
Bioinorganic Chemistry and Applications     Open Access   (Followers: 4)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 1)
Biointerphases     Open Access  
Biomacromolecules     Full-text available via subscription   (Followers: 17)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 2)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 30)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 24)
Bioorganic Chemistry     Hybrid Journal   (Followers: 5)
Biopolymers     Hybrid Journal   (Followers: 13)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 12)
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
Canadian Mineralogist     Full-text available via subscription   (Followers: 1)
Carbohydrate Research     Hybrid Journal   (Followers: 10)
Carbon     Hybrid Journal   (Followers: 49)
Catalysis for Sustainable Energy     Open Access   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 4)
Catalysis Science and Technology     Free   (Followers: 4)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 6)
Cellulose     Hybrid Journal   (Followers: 4)
Central European Journal of Chemistry     Hybrid Journal   (Followers: 5)

        1 2 3 4 5 6 | Last

Journal Cover Chemistry & Biodiversity
   Journal TOC RSS feeds Export to Zotero [7 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1612-1872 - ISSN (Online) 1612-1880
     Published by John Wiley and Sons Homepage  [1604 journals]   [SJR: 0.541]   [H-I: 35]
  • endo/exo Stereoselectivity in DielsAlder Reactions of
           α,β‐Dialkylated Conjugated Enals to Cyclic
           1,3‐Dienes: Intermediates in the Synthesis of
           (−)‐β‐Santalol and Its Analogs
    • Abstract: Highly exo‐selective [4+2] cycloadditions of cyclopenta‐1,3‐diene 2a to α,β‐dialkyl conjugated enals 5 are compared with the analogous endo‐favored DielsAlder reaction of cyclohexa‐1,3‐diene 7. The exo‐stereoselectivity is lower in the homologous case of methylcyclopenta‐1,3‐diene 9. This diastereoselectivity is discussed either in terms of a retro‐homo‐DielsAlder reaction, associated with thermodynamic control, or with respect to either a competing hetero‐DielsAlder/Claisen or Cope domino pathway, or retro‐Claisen/retro‐hetero‐DielsAlder of the endo‐homo‐cycloadducts. These hypothetical mechanisms have been examined by DFT calculations at the MPW1K(CH2Cl2)/6‐31+G** level of theory for the AlCl3‐mediated cycloadditions of 5d to 2a and 7. Application of Corey's methodology to the γ‐halogeno‐α‐methyl‐substituted dienophiles 5a and 5b allowed an enantioselective preparation of known and useful intermediates for the synthesis of either the naturally occurring (−)‐β‐santalol or its potentially olfactive structural analogs.
  • Synthesis by Ring‐Closing Alkyne Metathesis with Selective
           Hydrogenation, and Olfactory Comparison of (7E)‐ and
           (7Z)‐Cyclohexadec‐7‐enone (Aurelione®)
    • Abstract: Both CC‐bond isomers of cyclohexadec‐7‐enone (6, Aurelione®) were selectively synthesized via cyclohexadec‐7‐ynol (16) by ring‐closing alkyne metathesis of icosa‐2,18‐diyn‐9‐ol (15), employing an in situ‐formed catalyst from Mo(CO)6 and 4‐(trifluoromethyl)phenol. Pyridinium chlorochromate (PCC) oxidation and subsequent Lindlar hydrogenation afforded the (7Z)‐configured isomer (7Z)‐6, while hydrosilylation of the intermediate cyclohexadec‐7‐ynone (17), followed by desilylation, provided the (7E)‐configured cyclohexadec‐7‐enone ((7E)‐6). The substrate for the alkyne metathesis was prepared from cycloheptanone (7) by cycloaddition of chloromethylcarbene to its trimethylsilyl enol ether 8, and subsequent ring enlargement of the adduct 9 under rearrangement to 2‐methylcyclooct‐2‐enone (10), which was subjected to WeitzScheffer epoxidation and EschenmoserOhloff fragmentation to non‐7‐ynal (12). Its reaction with the Grignard reagent of 11‐bromoundec‐2‐yne (14), prepared from the corresponding alcohol 13 by AppelLee bromination, furnished the icosa‐2,18‐diyn‐9‐ol (15). While both isomers of cyclohexadec‐7‐enone (6) possess warm and powdery musk odors with tobacco‐type ambery accents, (7Z)‐6 is more animalic and waxy, whereas (7E)‐6 was found to be more floral, sweet, and hay‐like in tonality. Interestingly, however, with odor detection thresholds of 2.0 ng/l air and 2.3 ng/l air, respectively, both (7Z)‐6 and (7E)‐6 were found to be almost identical in their odor strength, with the (7Z)‐6 being only very slightly more powerful.
  • From Cassyrane to Cashmeran – The Molecular Parameters of Odorants
    • Abstract: This review, including some new experimental results, is the summary of a talk at the ‘flavors & fragrances 2013’ conference in Leipzig, organized jointly by the GDCh, the Liebig‐Vereinigung, and the EuCheMS. After times of searching for natural odor principles and serendipitous discoveries by chemical inspiration, directed odorant design today offers the highest hit rates for the discovery of new odorants, although serendipity still plays a role. Keeping intact the electronic shape required for a certain olfactophore‐binding geometry, one can add or subtract structural elements, rigidify molecular structures, or introduce more structural flexibility. To find out which structural features are critical, the ‘seco‐approach’, in which different fragments are removed by cutting strategic bonds, is the most analytical. Following this approach, such ingredients as Serenolide, Sylkolide, and Pomarose were designed. Transferring this design principle from the family of damascones to that of the theaspiranes led to the discovery of Cassyrane, though completely different structural features turned out to be relevant. Application of the seco‐concept to a 3,7a‐substituted 2,6,7,7a‐tetrahydro‐1H‐inden‐5‐yl musk lead structure derived from carotol resulted in the discovery of a new family of dienone musks with novel structureodor correlations. However, cutting the C(2)O bond of Cassyrane and oxidizing the resulting seco‐structure to the 1,2,5,1″‐tetradehydro derivative links the family of dienone musks with that of blackcurrant odorants, but the resulting target structures turned out to be potent orris odorants. (3E,5E)‐5‐(tert‐Butyl)octadeca‐3,5‐dien‐2‐one even possesses the lowest odor threshold in the whole ionone family (0.036 ng/l air), which could be rationalized by a superposition analysis on (−)‐cis‐γ‐irone. In the course of the synthesis of these high‐impact orris odorants, we discovered that, depending on the reaction conditions, the dehydration step of the intermediate 5‐hydroxyalk‐3‐yn‐2‐ones was accompanied by a carbenium‐ion rearrangement. Depending on the substitution pattern, these rearrangement products and their derivatives possessed interesting musky‐woody olfactory properties reminiscent of Cashmeran, demonstrating that the same structural elements can code for completely different odors, i.e., cassis, musk, orris, violet, and Cashmeran‐type, depending only on their spatial arrangement.
  • From Cats and Blackcurrants: Structure and Dynamics of the
           Sulfur‐Containing Cassis Odorant Cat Ketone
    • Abstract: Sulfur‐containing odorants and flavors play an important role in flavor and food industry, especially when meaty, garlic, onion, and vegetable scents are needed. Still, many S‐containing flavors also possess fruity scents and may be used in compositions of perfumes that require a fresh and fruity odor perception. They are naturally abundant in various fruits, essential oils, and food. Most of these compounds possess strong scents, and their scent composition is highly dependent on the concentration applied. At higher concentrations, they usually feature repellent off‐odors, while their sweet and fruity nature is only experienced at very low concentrations. This represents a challenge for their application in perfumery, as well as in food industry. From a molecular point of view, the endless structural and scent variety of these compounds makes them fascinating, especially as their O‐analogs are usually free of any malodors. Here, we report on the investigation of the gas‐phase structure and dynamics of the S‐containing blackcurrant odorant cat ketone (4‐methyl‐4‐sulfanylpentan‐2‐one). The work was performed by combining quantum‐chemical calculations and molecular‐beam Fourier‐transform microwave spectroscopy as complementary tools. Using this technique, we are able to determine the structures of sizeable molecules where energy differences are small and conformational distinction is not always possible by quantum‐chemical calculations alone. The presented results can be used for further structureactivity correlation studies, as well as for benchmarks to improve theoretical models, especially, as there is still significant interest in characterizing the various conformers of organic molecules in terms of relative energies, structures, and dipole moments.
  • A General and Concise Enantioselective Divergent Approach to
           13‐Alkyl‐Substituted Ionones
    • Abstract: A novel enantioselective divergent route to 13‐alkyl derivatives of α‐ and γ‐ionone, important components of perfumes and fragrances, is reported. This relatively short and convenient methodology takes advantage of the use of a common intermediate, easily obtained from highly enantiomerically enriched (S)‐α‐ionone, which avoids the separate installation of the butenone side chain at C(6) for each analog. Olfactory evaluation of synthesized compounds reconfirmed the influence of the hydrophobic interactions of alkyl substituents at C(5) with olfactory receptors (ORs) in the chemoreception of ionones, and suggested that a synperiplanar orientation of C(13) and the lateral chain is the better geometry fitting OR's cavity.
  • The Search for New Odorants: Synthesis of Animalic Fragrant and
           Musky/Ambery Compounds
    • Abstract: An overview of the recent research which allowed us to discover novel animalic odorants is presented. The new derivatives were prepared from readily available starting materials via easy reaction steps in good yields. They possess very different structures, such as bicyclic pentanols, glycolates, or tricyclic ketones, and all show interesting notes in the animalic fragrant family: from costus, leathery to ambery and musky scents, making them all attractive for different purposes.
  • ‘flavors & fragrances 2013’
  • The Importance of New Molecules in Selective Perfumery
    • Abstract: Perfumery can only evolve thanks to new ingredients. We highlight herein some key molecules and their use in ‘Selective Perfumery’: the violet odorant undecavertol, the floral nerolione and coumarone, the gourmand cappuccino levistamel, the sandalwood notes Sandranol® or Bacdanol®, the fruity top note Magnolia Flower oil, and finally the woody ambery Ambrocenide®.
  • Contents: C&B 10/2014
  • A Novel Oxy‐Oxonia(Azonia)‐Cope Reaction: Serendipitous
           Discovery and Its Application to the Synthesis of Macrocyclic Musks
    • Abstract: This brief review, including new experimental results, is the summary of a talk at the GDCh conference ‘flavors & fragrances 2013’ in Leipzig, Germany, 11th–13th September, 2013. Musk odorants are indispensable in perfumery to lend sensuality to fine fragrances, a nourishing effect to cosmetics, and a comforting feeling to laundry. We have recently found serendipitously a new oxy‐oxonia‐Cope rearrangement. In this account, we review the background of oxonia‐sigmatropic rearrangements and the discovery of this novel reaction. Special attention is focused on the versatile lactone and lactam formation reactions via [n+4] ring enlargement and the macrocyclization in the synthesis of new macrocyclic musks. The synthesized structures provide new insights into the structureodor relationships of musks.
  • The Search for New Amber Ingredients
    • Abstract: There is a constant need for developing new fragrance ingredients in the flavor and fragrance industry, as it allows perfumers to create unique and differentiating perfumes for fine as well as functional products. Among all the categories of notes used in perfume creation, amber notes are indispensible and ubiquitous in their presence in all perfumes. Not only amber notes impart high performance and substantivity to fragrances, but they are paramount in the development of classic and legendary fragrances. This article is based on the plenary lecture delivered at the flavor & fragrance 2013 conference of the German Chemical Society in Leipzig, Germany. The strategy, rationale, and the various synthetic approaches that led to the discovery of two new very powerful, woody, amber materials, Amber Xtreme® (1) and Trisamber® (2), are delineated.
  • Recent Results in the Search for New Molecules with Ambergris Odor
    • Abstract: The synthesis of new odorant molecules is still a challenging task for the fragrance chemist, because now as ever it is difficult to predict the odor properties of small organic molecules. Therefore, certain tools, such as, e.g., lead‐structure optimization of existing odorants, are helpful techniques. In this article, we describe the synthesis and the odor properties of a new molecule derived by the so‐called ‘seco’ lead‐structure optimization of the ambergris compound Ambroxide®. Based on these results, more representatives with similar structures have been synthesized and evaluated for their olfactory properties.
  • γ‐Unsaturated Aldehydes as Potential Lilial Replacers
    • Abstract: A series of Claisen rearrangements was undertaken in order to find a replacement for Lilial (=3‐(4‐(tert‐butyl)phenyl)‐2‐methylpropanal), a high‐tonnage perfumery ingredient with a lily‐of‐the‐valley odour, which is a CMR2 material [1]. 5,7,7‐Trimethyl‐4‐methyleneoctanal (10), the synthesis of which is described, became the main lead. It possesses an odour which is very close to that of Lilial but lacks its substantivity. Aldehydes with higher molecular weights than that of 10 were, therefore, synthesised in order to boost substantivity and to understand the structural requirements for a ‘Lilial’ odour. The aldehydes were obtained via Claisen rearrangements of ‘exo‐methylidene’ vinyl ethers, allenyl vinyl ethers, or allenyl allyl ethers. Alternatively, coupling of terminal alkynes with allyl alcohols led to the desired aldehydes. Derivatives of 10 and their sila analogues were also synthesised. The olfactory properties of all synthesised molecules were evaluated for possible structureodour relationships (SOR).
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