Patent ID: 6245926
Filing Date: 2001-06-12
Classification: C07F

Abstract:
A process for the preparation of alkylmonohydrohalosilanes which are liable to be subject to a dismutation catalysed by at least one Lewis acid,this process comprising the following steps:(a) redistribution of a reaction mixture between at least one first compound of formula (1): (R).sub.a (H).sub.b SiX.sub.4-a-b, and at least one second compound of formula (2): (R').sub.c SiX.sub.4-c, (1) and (2) wherein:a=0, 1,2 or 3; b=1,2 or 3; c=1, 2, 3 or 4 and a+b.ltoreq.3;R and R' are identical to or different from one another and are alkyl or aryl radicals;the X substituents are identical to or different from one another and correspond to a halogen;with the further proviso that at least one X atom is present in at least one of the two compounds of formulae (1) and (2), said redistribution taking place in the presence of a Lewis acids catalyst;(b) addition into the reaction mixture of at least one inhibitor of the redistribution catalyst; and(c) separation and collection of the alkylmonohydrohalosilanes formed in the crude redistribution reaction mixture (a);the crude reaction mixture being subjected to a distillation treatment involving at least one distillation column, andat least in a portion of the distillation circuit, the formed alkylmonohydrohalosilanes are in the presence of at least one inhibitor of any product capable of behaving as a redistribution catalyst with respect to said alkylmonohydrohalosilanes.