Abstract

Publisher Summary Today's silicone industry is based on direct reaction, which does not require a preformed organometallic reagent and a flammable solvent and does not generate large quantities of metal halide. This chapter discusses the recent developing trend of the direct reaction of elemental silicon with activated or unactivated alkyl chlorides, in particular, emphasizing direct reactions with a mixture of hydrogen chloride and activated alkyl chlorides, such as polychlorinated methanes, silylmethyl chlorides and dichlorides, and allyl chloride. About 90% of the starting materials for the silicone industry are prepared by the direct reaction and the other portion by hydrosilylation reactions. Furthermore, in the direct reaction of elemental silicon with activated alkyl chlorides and polychloromethanes, the decomposition of the reactants can be suppressed and the production of polymeric carbosilanes reduced by adding hydrogen chloride to the reactants. These reactions provide a variety of new organosilicon compounds containing Si–H and Si–Cl functionalities, which should find considerable application in the silicone industry.

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