Reactions de dechlorhydratation d'organochlorohydrogermanes et -polygermanes

Abstract 1,8-Diazabicyclo[5.4.0]undec-7-ene appears to be an efficient dehydrochlorination agent for the organochlorohydrogermanes PhCl 2 GeH, R 2 ClGeH (R = Et, Ph). In diluted solutions the intramolecular α-elimination process leads to germylene through germanate formation while in concentrated solutions intermolecular reactions are predominant and give organochlorohydropolygermanes in good yields. The latter reaction is an interesting and selective way to obtain digermanes with bulky substituents (R = mesityl). Both intra- and inter-molecular dehydrochlorination mechanisms are discussed.