Abstract
Evidence is presented for the formation of disilacyclobutane products along with data consistent with the formation of these products in a second-order reaction of silylenes, and the minor products are considered. Reaction conditions and product yields are given for the pyrolysis of pure dimethoxytetramethyldisilane and for the copyrolysis of the disilane and a tenfold excess of propyne, the latter compound acting as a substrate for dimethylsilylene addition. Spectroscopic data for the disilacyclobutanes and for the propyne adduct of dimethylsilylene are tabulated; and the formation of the minor products trimethylsilane and 1,1,3-trimethyl-1,3-disilacyclobutane is discussed. (auth)
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