Construction of Novel Silicon? Silicon Double-bond Compounds Bearing Alkynyl Substituents

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We successfully accomplished the synthesis, isolation and characterization of 1, 2-dialkynyldislenes containing various substituents. A closer investigation of their spectroscopic properties clearly showed a conjugation ofπ-electrons between the disilene and alkynyl moieties. Desilylation or degermylation reactions of trimethylsilylethynyl or trimethylgermylethynyl-substituted disilenes with methyllithium resulted in the formation of the corresponding lithium acetylide derivatives, which were subsequently protonated to yield 1, 2-dialkynyldislenes with terminal alkynyl groups. These disilenes are potentially useful synthons for the construction of novelπ-conjugated systems containing disilene units