Patent ID: 6727376
Filing Date: 2004-04-27
Classification: C07F

Abstract:
A process for preparing organohalosilanes of the following general formula (I):R1nHmSiX4-n-mâ€ƒâ€ƒ(I) wherein R1 is a monovalent hydrocarbon group, X is a halogen atom, n is an integer of 1 to 3, m is an integer of 0 to 2, and the sum of n and m is an integer of 1 to 3, by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst,a contact mass composed of the metallic silicon and the catalyst further containing an effective amount of a phosphonium compound having on the molecule at least one group of the following general formula (II): [R2R3R4Pâ€”]+Yâˆ’â€ƒâ€ƒ(II) wherein R2, R3 and R4 are each independently a monovalent hydrocarbon group and Y is a halogen atom or acid group.