Dow Corning Corporation

Brian R Keyes

Roland L Halm

Kirk M Chadwick

A process for the hydrogenation of chlorosilanes. The process comprises contacting a chlorosilane with aluminum and a hydrogen source selected from a group consisting of hydrogen gas and gaseous hydrogen chloride in the presence of a catalyst. The catalyst is selected from a group consisting of copper and copper compounds, tin and tin compounds, zinc and zinc compounds, and mixtures thereof.

Process for hydrogenation of chlorosilane

A process for the preparation of more highly alkylated silanes and disilanes. The process comprises (A) contacting a halodisilane, with an alkyl halide in the presence of a metal, such as aluminum, which serves as a halogen acceptor, (B) reacting the halodisilane with the alkyl halide in the presence of the metal at a temperature greater than about 150.degree. C. to form the more highly alkylated silanes and disilanes and a metal halide; and (C) isolating and separating the more highly alkylated silanes and disilanes.

Alkylation of halodisilanes

A process for the preparation of more highly alkylated silanes. The process comprises (A) contacting a halide of silicon, a silane or a disilane, with an alkyl halide in the presence of a metal, such as aluminum, which serves as a halogen acceptor, and a sufficient quantity of a catalyst effective in improving exchange of alkyl groups from the alkyl halide with said halogen atoms of the halide of silicon; (B) reacting the halide of silicon with the alkyl halide in the presence of the metal and the catalyst at a temperature greater than about 150.degree. C. to form the more highly alkylated silanes and a metal halide; and (C) isolating and separating the more highly alkylated silanes.

Preparation of organosilanes

An improved process for the preparation of multi-organic substituted silanes from the reaction of halides of silicon with an alkyl halide in the presence of a halogen-accepting metal is described. The improvement integrates a redistribution process into the alkylation process. The redistribution process involves an interaction between a multi-organic substituted silane and a halosilane with fewer organic substituents whereby an organic group from the multi-organic substituted silane is exchanged with a halogen group of the less organic substituted halosilane.

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Salt Lake City, UT, United States of America

Brian R Keyes