Patent ID: 6313342
Filing Date: 2001-11-06
Classification: C07C

Abstract:
In a process for the preparation of an ester of mercaptocarboxylic acid of formula:HS--X--COOR (I)in which X denotes a linear or branched alkylene radical containing from 1 to 4 carbon atoms and R a linear or branched alkyl radical containing from 1 to 18 carbon atoms, comprising reacting ammonium hydrosulphide or an alkali or alkaline-earth metal hydrosulphide with the corresponding halocarboxylic ester of formula:Y--X--COOR (II)in which R and X have the same meanings as above and Y denotes a chlorine or bromine atom, the improvement comprising conducting the reaction under a hydrogen sulphide pressure of at least 10 bars absolute and at a temperature from 10 to 40.degree. C.