Patent ID: 6740767
Filing Date: 2004-05-25
Classification: C07F

Abstract:
A process for producing sulfur containing organosilicon compounds having the formula (RO)3-mRmSiâ€”Alkâ€”Snâ€”Alkâ€”SiRm(OR)3-m wherein R represents independently a monovalent hydrocarbon having 1-12 carbon atoms, Alk represents a divalent hydrocarbon having 1-18 carbon atoms, m is an integer representing 0, 1 or 2, n is an integer with a value of 2-8, comprising the steps of (I) heating and reacting (A) a sulfide compound having the formula M2Sn or MHS wherein H is hydrogen, M is ammonium or an alkali metal, and n is 1-8, with (B) a silane compound having the formula (RO)3-mRmSiâ€”Alkâ€”X wherein X is Cl, Br or I, and m is 0, 1, or 2, and (C) sulfur, in the presence of a phase transfer catalyst and an aqueous phase containing a buffer or a basic compound, to form a product mixture, (II) heating the product mixture to a temperature of 80-100Â° C., and (III) separating the organosilicon compound from the product mixture.