A convenient method for enzymatic benzyl-alkyl transesterification under mild neutral conditions
摘要:
Lipases from Candida cylindracea and from Pseudomonas fluorescens efficiently catalyse the benzyl to alkyl transesterification in organic solvents under mild conditions in nearly quantitative yields.
Selective Esterification of Aliphatic Carboxylic Acids in the Presence of Aromatic Carboxylic Acids Over Monoammonium Salt of 12‐Tungstophosphoric Acid
作者:B. Y. Giri、B. L. A. Prabhavathi Devi、K. N. Gangadhar、K. Narasimha Rao、N. Lingaiah、P. S. Sai Prasad、R. B. N. Prasad
DOI:10.1080/00397910500328266
日期:2006.2
Abstract Monoammonium salt of 12‐tungstophosphoric acid [(NH4)H2PW12O40] was found to be a practical and useful heterogeneous catalyst for an efficient and selective esterification of aliphatic carboxylicacids with alcohols in the presence of aromaticcarboxylicacids. The heteropoly acid–based heterogeneous catalyst has the advantages of a simple workup procedure, water insolubility, and good activity
Process for the preparation of carboxylic benzyl esters
申请人:——
公开号:US20030233008A1
公开(公告)日:2003-12-18
Carboxylic benzyl esters can be prepared by reacting benzyl chloride with carboxylic acids in the presence of one or more quaternary ammonium carboxylates as catalyst.
Convenient Synthesis of Benzyl and Allyl Esters Using Benzyl and Allyl 2,2,2-Trichloroacetimidate
作者:George Kokotos、Antonia Chiou
DOI:10.1055/s-1997-1162
日期:1997.2
Benzyl and allyl 2,2,2-trichloroacetimidate are efficient reagents for the preparation of benzyl and allyl esters of carboxylic acids in the presence of a catalytic amount of boron trifluoride-diethyl ether complex.
(E)-phenyl 2-pyridyl ketone O-acyloximes (PPAO) could be highly activated by metal ions such as Fe3+, Cu2+, and Zn2+, and the most effective catalyst for the synthesis of carboxylic esters was found to be Zn2+. Furthermore, sterically hindered carboxylic esters were easily obtained utilizing PPAOs and alcoholates in high yields.
Verfahren zur Herstellung von Carbonsäurebenzylestern
申请人:Bayer Aktiengesellschaft
公开号:EP1371627A1
公开(公告)日:2003-12-17
Carbonsäurebenzylester können durch Umsetzung von Benzylchlorid mit Carbonsäuren in Gegenwart eines oder mehrerer quartären Ammoniumcarboxylate als Katalysator hergestellt werden.