Photolysis of Dodecamethyl Cyclohexasilane: Formation of Both Methylsilene and Dimethylsilylene

摘要

Experimental and spectroscopic investigations of the products of dodecamethlhexasilane photolysis on reaction with labeled organic reagants throw new light on the formation of methylsilene and dimethylsilylene and their interconversion reactions. Photolysis of dodecamethylcyclohexasilane (I) with light of 254 nm has been reported to yield decamethylcyclopentasilane and dimethylsilylene (II). This procedure is in fact the standard method to generate II in solution. We would like to report experimental and spectroscopic observations which demonstrate that this system is more complicated than the current literature suggest. Specifically, that photolysis of I in the presence of ethanol-O-d sub 1 leads to both II and methylsilene (III). Dimethylsilylene (II) reacts with ethanol-O-d sub 1 to yield dimethylethoxysilane-Si-d 1 (IV-Si-d sub 1) while III reacts with ethanol-O-d sub 1 to yield dimethylethoxysilane-C-d sub 1 (IV-C-d sub 1).