Chemistry Letters, Vol.31, No.3, 364-365, 2002
Reactions of silenes produced thermally from pivaloyl- and adamantoyltris(trimethylsilyl)silane with bis(trimethylsilyl)butadiyne
Thermolysis of pivaloyl- and adamantoyltris(trimethylsilyl)silane (1a) and (1b) with bis(trimethylsilyl)butadiyne at 120 degreesC gave the respective [2 + 2] cycloadducts. Similar thermolysis of 1a and 1b with bis(trimethylsilyl)butadiyne at 160 degreesC, however, afforded 2-oxa-1,1,3,5-tetrakis(trimethylsilyl)-4-trimethylsilylethynyl-1-silacyc lopent-4-ene derivatives in high yields.