Mechanism of the Thermal Decomposition of Dimethylsilane at Atmospheric Pressures in the Gas Phase

摘要

A mechanism for the gas-phase, high pressure thermal decomposition of dimethylsilane is proposed which explains in a kinetically reasonable way the production of the complex linear and cyclic carbosilane products observed for this reaction. The mechanism is based on unimolecular and bimolecular reactions of silylenes, which (with one exception) are all well-known or previously proposed processes. A crude modeling of the dimethylsilane pyrolysis, using assigned rate constants derived from reported Arrhenius parameters (or ay analogy with reported parameters) or from thermochemical kinetic considerations in the absence of such data, is shown to be in reasonable agreement with the experimental data. Keywords: Silanes, Reprints. (MJM)