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The inorganic divalent silicon species,1 dihalosililylenes, have been known for many years, and difluorosilylene,2 in particular, has been studied quite intensively. The structure of this relatively stable species (150 sec half-life at 01 mm pressure and 25°C) has been determined and its chemistry is currently under investigation in several laboratories. Renewed interest has also been observed in the chemistry of dichlorosilylene.3 The silylenes bearing an organic substituent, although believed to be reactive intermediates in many syntheses, have remained a relatively poorly understood subject. The absence of a general, convenient, and less ambiguous source of silylenes has been a serious handicap in establishing the general chemistry of these intermediates. It is now apparent that the thermolysis of alkoxydisilanes provides such a source of silylenes, and in this paper we shall review the evidence supporting the intermediacy of silylenes in this reaction as well as the general picture of the chemistry of organosilylenes which is emerging from these studies. The halodisilanes are known to undergo a redistribution reaction at elevated temperatures to yield silanes and higher polysilanes' and this decomposition has been shown in some cases to proceed via the formation of dihalosilylenes.L 4

Divalent silicon intermediates in the pyrolysis of alkoxypolysilanes