Cyclohexasilanes with exocyclic organogermanium, -tin or -lead groups

A new class of mono- (2- 4) and bis(undecamethylcyclohexasilanyl) (5-9) sub stituted germanium, tin and lead compounds is described. These molecules ar e accessible by treatment of undecamethylcyclohexasilanyl potassium (1) wit h chlorogermanes, -stannanes or plumbanes. Attempts to generate bis(cyclohe xasilanyl)methanes, -plumbanes or tris(cyclohexasilanyl)-methylstannane sta rting from dihalomethanes, -plumbanes or methyltrichlorostannane and 1 resu lt only in transmetallation reactions. The molecular structures of a mono- (3) and a dicyclohexasilanyl stannane derivative 5 were determined by singl e-crystal X-ray crystallography. (C) 2000 Elsevier Science S.A. All rights reserved.