A novel phenyl -bromine ligand exchange reaction on germanium by boron tribromide

摘要

A novel phenyl-bromine ligand exchange reaction by BBr_3 on germanium was investigated that proceeds without breaking Ge-CH_2Ar bond.Typically,the reaction between(PhCH_2)_3PhGe and BBr_3 resulted exclusively in the formation of(PhCH_2)_3GeBr.As part of an extensive study of novel heterodi-topic hosts in which a germanium moiety acts as an anion-capturing site,we wanted to prepare,as an intermediate for germanium-containing calixarene,l,3-bis[(bromodimethylgermyl)methyl]benzene(2)by the reaction between l,3-bis[dimethyl(phenyl)germylmethyl] benzene(1)and bromine(Eq.1).Though it is known that tetraphenylgermane(3)can be conveniently converted to bromotriphenylgermane(4)and/or dibromodiphenylger-mane(5)depending on the reaction condition,the reaction between 1 and bromine failed to give 2.