Patent ID: 8008520
Filing Date: 2011-08-30
Classification: C07F

Abstract:
1. A process for the preparation of a thiocarboxylate silane represented by at least one of the formulae: wherein: each occurrence of G each occurrence of R is, independently, selected from the group consisting of hydrogen, and alkyl, alkenyl, alkynyl, aryl, and aralkyl groups, with each R containing from 0 to 30 carbon atoms; Y is carbonyl, C(═O); each occurrence of X is, independently, selected from the group consisting of RO—, R each occurrence of the subscript a is independently an integer from 1 to 6; each occurrence of the subscript b is independently an integer from 1 to 100; each occurrence of the subscript c is independently an integer from 1 to 6; each occurrence of the subscript d is independently an integer from 1 to 100; and, each occurrence of the subscript f is independently an integer from 1 to 6, with the proviso that ab=df; which comprises reacting an aqueous solution of a salt of a thiocarboxylic acid represented by the formula: wherein: each occurrence of G each occurrence of M is an alkali metal, ammonium, or a mono-, di-, or tri-substituted ammonium; and each occurrence of the subscript a is independently an integer from 1 to 6; with a silane represented by the formula: wherein: each occurrence of G each occurrence of L is a halogen atom, sulfonate group, sulfinate group, or carboxylate group; each occurrence of X is, independently, selected from the group consisting of RO—, R each occurrence of the subscript c is independently an integer from 1 to 6; and, each occurrence of the subscript f is independently an integer from 1 to 6; and in the absence or presence of phase transfer catalyst to provide a thiocarboxylate silane.