Process for the preparation of alpha-chloromethylsilanes

摘要

An improvement in a process for the preparation of an alpha -chloromethylsilane of the general formula ClCH2(CH3)3-nSiCln (n = 0 to 3)II by chlorination of a methylchlorosilane of the general formula (CH3)4-nSiCln I with elemental chlorine while exposing the reaction mixture to light, the improvement residing in maintaining the reaction mixture at a temperature in the vicinity of the boiling point of the methylsilane to be chlorinated by regulating the metering in of methylsilane to be chlorinated and continuously passing chlorine gas through the reaction zone at a constant rate and withdrawing reaction product at such a rate that the concentration of chloromethylsilane amounts up to 18 weight percent.