Silicon halides pyrolysis

Free carbon thereby is deposited on the reactive mass of silicon, covering it over and serving as a catalyst for further pyrolysis of methyl groups. Furthermore, the methane and hydrogen which appear in the exit gases impair the efficiency of the condensers and represent a waste of organic halide. For these reasons the formation of trichlorosilanes is to be avoided as uneconomical and detrimental to the continued production of dichlorosilanes. 

Boron-containing organosilicon polymers have also been synthesized via a sodium coupling reaction of silicon and boron halides or alkyl boron halides in hydrocarbon solvents [37]. On pyrolysis, mixed ceramics comprising SiC, SiBjt, and Si-(B, C) can be obtained. 

---