Patent ID: 7884225

Claim:
A method for the preparation of 3-chloropropyldimethylchlorosilane, said method comprising reacting dimethylhydrochlorosilane with allyl chloride in the presence of a catalytically effective amount of a catalyst selected from the group consisting of di-μ-chlorobis(η-1,5-hexadiene)diiridium, di-μ-bromobis(η-1,5-hexadiene)diiridium, di-μ-iodobis(η-1,5-hexadiene)diiridium, di-μ-chlorobis(η-1,5-cyclooctadiene)diiridium, di-μ-bromobis(η-1,5-cyclooctadiene) diiridium, di-μ-iodobis(η-1,5-cyclooctadiene)diiridium, di-μ-chlorobis(η-2,5-norbornadiene)diiridium, di-μ-bromobis(η-2,5-norbornadiene)diiridium, and di-μ-iodobis (η-2,5-norbornadiene)diiridium, wherein at least one auxiliary in the free or supported state formed by a mixture comprising 1,5-cyclooctadiene and a compound selected from the group consisting of cyclohexanone, ethyl ether and benzoquinone is added to the reaction mixture.