Results 321 to 330 of about 136,021 (344)
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Journal of Pharmaceutical Sciences, 1983
Preparation of some simple lactone analogues of picrotoxin and their biological evaluation is reported. Certain analogues possessed activity, but at potencies insufficient to warrant further work.
James D. McChesneyx, Alan F. Wycpalek
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Preparation of some simple lactone analogues of picrotoxin and their biological evaluation is reported. Certain analogues possessed activity, but at potencies insufficient to warrant further work.
James D. McChesneyx, Alan F. Wycpalek
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American Journal of Contact Dermatitis, 1996
Sesquiterpene lactones are a large, diverse group of chemicals found in several plant families that cause allergic contact dermatitis. The biological, botanical, allergenic, and structural significance of sesquiterpene lactones is explored as well as the clinical characteristics of cutaneous reactions.
Erin M. Warshaw, Kathryn A. Zug
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Sesquiterpene lactones are a large, diverse group of chemicals found in several plant families that cause allergic contact dermatitis. The biological, botanical, allergenic, and structural significance of sesquiterpene lactones is explored as well as the clinical characteristics of cutaneous reactions.
Erin M. Warshaw, Kathryn A. Zug
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Russian Chemical Reviews, 1968
This is a review of investigations on the polymerisation of lactones. The author briefly touches on the history of the subject, the advantage of the synthesis of polyesters by the method of polymerisation over polycondensation, and the essential nomenclature of lactones.
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This is a review of investigations on the polymerisation of lactones. The author briefly touches on the history of the subject, the advantage of the synthesis of polyesters by the method of polymerisation over polycondensation, and the essential nomenclature of lactones.
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1991
Lactones are often obtained by carbonylation reactions closely related to the acyclic ester syntheses described in the previous chapter. Although only limited data are available for carbonylative routes to four- and six-membered lactone rings, the preparation of five-membered (γ) lactones has been one of the most intensively studied areas of ...
D. J. Thompson +2 more
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Lactones are often obtained by carbonylation reactions closely related to the acyclic ester syntheses described in the previous chapter. Although only limited data are available for carbonylative routes to four- and six-membered lactone rings, the preparation of five-membered (γ) lactones has been one of the most intensively studied areas of ...
D. J. Thompson +2 more
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2003
The sesquiterpene lactone mix (SL mix) consists of 3 allergens: alantolactone, costunolide, dehydrocostus lactone.
Paulsen, E., Andersen, K.E.
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The sesquiterpene lactone mix (SL mix) consists of 3 allergens: alantolactone, costunolide, dehydrocostus lactone.
Paulsen, E., Andersen, K.E.
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Phenylsulphenyl-lactonization: an easy and synthetically useful lactonization procedure
Journal of the Chemical Society, Chemical Communications, 1977Certain unsaturated carboxylic acids react with benzene sulphenyl chloride in the presence of triethylamine to afford phenylsulphenyl-lactones, a new class of synthetically useful intermediates.
Zenon Lysenko, Kyriacos C. Nicolaou
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Cross‐Metathesis of α‐Methylene Lactones II: γ‐ and δ‐Lactones.
ChemInform, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Amy R. Howell +4 more
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1975
Esters have two characteristic absorptions arising from the C=O and C—O— groups. The carbonyl frequency is notably raised above that of normal ketones by the influence of the adjoining oxygen atom, so that differentiation of the two is usually possible. There is, however, a certain amount of overlap between, for example, unsaturated esters in which the
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Esters have two characteristic absorptions arising from the C=O and C—O— groups. The carbonyl frequency is notably raised above that of normal ketones by the influence of the adjoining oxygen atom, so that differentiation of the two is usually possible. There is, however, a certain amount of overlap between, for example, unsaturated esters in which the
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ChemInform Abstract: Saturated and Unsaturated Lactones
ChemInform, 1996AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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Lactones 29. Enzymatic resolution of racemic γ-lactones
Biocatalysis and Biotransformation, 2007Studies on the application of commercially available enzymes to resolution of the racemic unsaturated γ-lactones: 5-(3-methylbutylidene)-4-methyl-tetrahydrofuran-2-one (1a) and 5-(3,3-dimethylbutylidene)-4-methyl-tetrahydrofuran-2-one (2a) are presented.
Czesław Wawrzeńczyk +2 more
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