A 1,2-silicon shift in cyclopropylidenes leading to 1-trialkylsilylcyclopropenes

Abstract

1,1-Dibromo-2-trialkylsilylcyclopropanes, readily prepared by dibromocyclopropanation of vinyltrialkylsilanes, react with methyllithium at –90 to 20 °C to give high yields of trialkylsilylcyclopropenes in which the silicon has apparently migrated to C-1.