Hydrogen-abstraction reactions from silanes. Part I. The reactions of methyl radicals with trichlorosilane, methyldichlorosilane, and methyltrichlorosilane

By photolysing azomethane in the presence of the silane the following Arrhenius parameters have been obtained for hydrogen-abstraction reactions of methyl radicals: [graphic omitted] The high reactivities of chlorosilanes in free-radical reactions appear to be due to abnormally high A-factors rather than to low activation energies.