Process for the preparation of dialkyldichlorosilanes of high purity

摘要

The present invention deals with the preparation of highly pure dialkyldichlorosilanes, in particular of methylalkyldichlorosilanes which can be employed in the modification of silicones. The process is based on the addition reaction, which is known per se, of aliphatics having an olefinic double bond to hydrogensilanes in the presence of platinum catalysts. According to the invention, this reaction is carried out in a homogeneous system in the presence of small amounts of benzothiazole. This addition prevents the formation of trichlorosilyl compounds, which cause undesired side reactions during silicone modification.