US 4,101,397 AGranted

Process for the preparation of alpha-chloromethylsilanes

AssigneeDynamit Nobel Aktiengesellschaft

InventorsHans-Joachim Kotzsch, Gerhard Muller, Hans-Joachim Vahlensieck

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Abstract

An improvement in a process for the preparation of an .alpha.-chloromethylsilane of the general formula ClCH.sub.2 (CH.sub.3).sub.3-n SiCl.sub.n (n = 0 to 3) II by chlorination of a methylchlorosilane of the general formula (CH.sub.3).sub.4-n SiCl.sub.n 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.

Claims9

Dependent claims

In a process for the preparation of an .alpha.-chloromethylsilane of the general formula

ClCH.sub.2 (CH.sub.3).sub.3-n SiCl.sub.n (n = 0 to 3) II
by contacting a methylsilane of the formula
(CH.sub.3).sub.4-n SiCl.sub.n I
with elemental chlorine under illumination, the improvement which comprises introducing chlorine into a reaction zone at a constant rate, maintaining said reaction zone in the vicinity of the boiling point of the methylsilane to be chlorinated, introducing methylsilane to be chlorinated into said reaction zone at such a rate so as to maintain the temperature of the reaction mixture in the vicinity of the boiling point of the methylsilane to be chlorinated and continuously withdrawing reaction product at such a rate that the concentration of chloromethylsilane in the reaction product amounts to up to 18 percent by weight.

1 more element

Dependencies are inferred from the claim text.