Reactions d'insertion de germylenes dans la liaison germanium—phosphore de germylphosphines et de germaphospholannes

Abstract

The mono- or di-halogenated germylenes (e.g. phenylchlorogermylene and difluorogermylene) insert, into the germanium—phosphorus bond of germylphosphines to form phosphorylated digermanes. The phenylchlorogermylene adducts, which are stable at room temperature, lead by thermal α-elimination to phosphorylated germylenes. The addition of difluorogermylene to the diastereoisomers of 2-methylphenylgerma-1-phenylphospholane, which has chiral germanium and phosphorus atoms, showed that this non-stereospecific reaction proceeds by nucleophilic attack of phosphorus at the germanium atom of germylene, followed by rupture of the germanium—phosphorus bond and formation of a dipolar intermediate.