Pyrolysis of trichlorosilane in the presence of chloroform

The pyrolysis of trichlorosilane in the presence of different amounts of ch loroform and the copyrolysis of HSiCl3 with buta-1,3-diene in the presence of 1 mol.% chloroform were studied. The enthalpies of formation of products resulting from the pyrolysis of HSiCl3 in the presence of chloroform were calculated by the quantum chemical method. Based on the thermochemical data as well as data from GLC and mass spectrometry, it was concluded from the condensate composition that introduction of chloroform into the zone of pyr olysis of HSiCl3 favors generation of silylenes.