- Malodour reducing composition and uses thereof
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The invention relates to a malodour reducing composition comprising: A) at least one phenylglycidate of formula (1): wherein: - R1 is a C1-C4 branched or linear alkyl group, - R2 is hydrogen or methyl, and - R3 is hydrogen, a C1-C4 branched or linear alkyl group or a methoxy group, and B) at least one 1,2 diketone of formula (2) or (3): wherein: - R4, R5 and R7 may be independently, a C1-C5 linear or branched alkyl or alkenyl group; - R6 is a (C1-C5) alkylidene; - R4 and R5 may also form a C4-C7 saturated or unsaturated alicyclic or heterocyclic ring structure, optionally substituted by (C1-C4) alkyl groups; - R6 and R7 may also form a C4-C7 unsaturated, alicyclic or heterocyclic ring structure optionally substituted by (C1-C4) alkyl groups; the weight ratio of glycidate A to 1,2 diketone B being from 1:99 to 99:1. The invention also relates to the fragrance compositions and consumer products containing this malodour reducing composition.
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- Catalytic investigations of calix[4]arene scaffold based phase transfer catalyst
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Calix[4]arene scaffold based quaternary ammonium salts as multi-site phase transfer catalysts were prepared and their catalytic activities were investigated for Darzens condensation, O/N-alkylation reactions and ethyl benzene oxidation. These calix[4]arene based multi-site phase transfer catalysts showed significant high catalytic activity as compared to single-site phase transfer catalysts.
- Srivastava, Pallavi,Srivastava, Rajendra
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p. 4489 - 4493
(2008/02/03)
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- Epoxide Synthesis in Interfacial Solid-Liquid Conditions
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In this paper an analysis of the factors responsible for discrimination among differing structures of organic reagents by the microcrystalline structure of solids is presented.As a vehicle of this study, the epoxide synthesis using three sulfur ylide precursors (sulfonium and sulfoxonium salts) and four microcrystalline solids was investigated.Neither the surface area nor the number of active sites at the solid surface control the epoxide yield.It appears that the cell lattice of the solid determines the ylide structure, its nucleophilicity, and thus the reaction yield.
- Borredon, E.,Clavellinas, F.,Delmas, M.,Gaset, A.,Sinisterra, J. V.
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p. 501 - 504
(2007/10/02)
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- Dioxirane Chemistry. Part 15. Rate studies on Epoxidations by Dimethyldioxirane
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The relative rates of epoxidation by dimethyldioxirane, (1), of a series of 4-substituted (E)-ethyl cinnamates have been studied.The data were treated with the Hammett linear free energy relationship and give ρ = - 1.53 indicating an electrophilic O-atom transfer.Second-order rate coefficients were determined for the epoxidation of (E)-ethyl cinnamate by (1) at several temperatures and the Arrhenius factors were determined, Ea = 14.1 kcal mol-1, log (A/s-1) = 7.41.
- Murray, Robert W.,Shiang, Dawn L.
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p. 349 - 352
(2007/10/02)
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