Synthesis of trimethylsilyl-μ-S,S′-ethylenedithiolatohexacarbonyldiiron and 1-methyl-3-trimethylsilyl-2,5-dithiacyclopentane by reaction of trimethylvinylsilane with S8 in the presence of Fe3(CO)12
(III)) has been studied at temperatures from 400 to 600° C using the pulse pyrolytic GC/MS method. The major decomposition of the compounds leads to trimethylvinylsilane, carbon disulphide, silicon disulphide, thiophene and its homologues as well as lower hydrocarbons and trimethylsilyl-substituted thiophenes. No similarity has been found between the electron-impact induced and thermal processes.