Patent ID: 6140526
Filing Date: 2000-10-31
Classification: C07F

Abstract:
A process for the preparation of organosilanes comprising the steps of:1) carrying out a redistribution reaction between a chlorinated organohydrosilane of formula (1): (R).sub.a (H).sub.b SiCl.sub.4-a-b and an organosubstituted and optionally chlorinated silane of formula (2): (R').sub.c SiCl.sub.4-c, wherein: a=1 or 2; b=1 or 2; a+b=3; c=1, 2, 3 or 4; and the symbols R and R' are alike or different and each represent a linear or branched C.sub.1 -C.sub.6 alkyl radical or a C.sub.6 -C.sub.12 aryl radical; said redistribution reaction taking place in the presence of an effective amount of a catalyst consisting of a Lewis acid of formula (3) M(X).sub.d, wherein: M represents a metal selected from the group consisting of Ti, Fe, Cu, Ag, Zn, Cd, Hg, Al, Ga, In, B, Sn, Pb, Sb and Bi; X represents a halogen atom; and d represents the valency of the metal M;2) then, adding at least one inhibitor of the redistribution catalyst, said inhibitor being a fluid polyorganosiloxane having a viscosity at 25.degree. C. at most equal to 5000 mPa.cndot.s and being used in proportions such that the ratio: ##EQU3## is equal to or less than 0.9; and 3) carrying out a separation by distillation of the chlorinated organohydrosilane produced by redistribution.