Development and Applications of Transesterification Reactions Catalyzed by N-Heterocyclic Olefins
作者:Marcus Blümel、Janina-Miriam Noy、Dieter Enders、Martina H. Stenzel、Thanh V. Nguyen
DOI:10.1021/acs.orglett.6b00835
日期:2016.5.6
A novel method to utilize N-heterocyclic olefins (NHOs), the alkylidene derivatives of N-heterocycic carbenes, as organocatalysts to promote transesterification reactions has been developed. Because of their strong Brønsted/Lewis basicity, NHOs can enhance the nucleophilicity of alcohols for their acylation reactions with carboxylic esters. This transformation can be employed in industrially relevant
A novel aromatic carbocation-based coupling reagent for esterification and amidation reactions
作者:Thanh V. Nguyen、Demelza J. M. Lyons
DOI:10.1039/c4cc09539a
日期:——
Driven by aromatization: a novel tropylium-based coupling reagent has been developed to facilitate nucleophilic coupling reactions of carboxylic acids.
Tropolonate Salts as Acyl-Transfer Catalysts under Thermal and Photochemical Conditions: Reaction Scope and Mechanistic Insights
作者:Demelza J. M. Lyons、Claire Empel、Domenic P. Pace、An H. Dinh、Binh Khanh Mai、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1021/acscatal.0c03702
日期:2020.11.6
strong nucleophilicity and photochemical activity, can promote the coupling reaction between alcohols and carboxylic acid anhydrides or chlorides to give products under thermal or blue light photochemical conditions. Kinetic studies and density functional theory calculations suggest interesting mechanistic insights for reactions promoted by this acyl-transfer catalytic system.
CAROTENOID-CONTAINING COMPOSITION AND METHOD FOR PRODUCING SAME
申请人:Fujifilm Corporation
公开号:EP2767274A1
公开(公告)日:2014-08-20
A carotenoid-containing composition including: a carotenoid component containing a crystalline carotenoid that is in an amorphous state; a (poly)glycerol fatty acid ester that contains from one to six glycerol units and from one to six fatty acid units and has at least one hydroxyl group resulting from a glycerol unit; a fatty acid ester component which is at least one selected from the group consisting of triesters of glycerol and fatty acids, and esters of alcohols having one hydroxyl group and fatty acids, contains no hydroxyl group in a molecule, and has from 10 to 60 carbon atoms in total; and an antioxidant.
An oil-in-water emulsion composition, including dispersed particles containing from 0.05% by mass to 2.5% by mass of lycopene; and at least one kind of compound selected from the group consisting of phenoxyethanol, an aliphatic diol compound having a carbon chain length of from 3 to 10 carbon atoms, an ether compound of glycerin and aliphatic alcohol, and a carbamic acid ester compound.