A novel route to chlorodimethylsilane

Article abstract of DOI:10.1139/v00-025

A new efficient laboratory method of preparation of chlorodimethylsilane (Cl(CH₃)₂SiH) has been elaborated, which is a modification of the Eaborn et al. method (34) and is based on a transsilylation reaction of substituted (amino)dimethylhydrosilanes, R₂NSiMe₂H (R₂ = Me₂, Et₂, (CH₂)_n, etc.) with dimethyldichlorosilane (Me₂SiCl₂). The reaction proceeds at reflux, at 70°C, preferably with an excess of Me₂SiCl₂. The most important feature of this novel method is a recovery of intermediate (amino)chlorodimethylsilanes (R₂NSiMe₂Cl), which can be again reduced to R₂NSiMe₂H. The transsilylation mechanism has been proven by reaction of (diethylamino)methylphenylsilane with Me₂SiCl₂. The products of this latter reaction are HMePhSiCl and R₂NSiMe₂Cl, thus a disproportionation mechanism has been excluded. New substituted bis(amino)dimethylsilanes ((R₂N)₂SiMe₂), (amino)dimethylchlorosilanes (R₂NSiMe₂Cl), and (amino)dimethylhydrosilanes (R₂NSiMe₂H) have been synthesized and characterized by NMR and IR.