Abstract
The reaction of Me 5 C 5 GeCH(SiMe 3 ) 2 with LiC-(SiMe 3 ) 3 affords (Me 3 Si) 3 CGeCH(SiMe 3 ) 2 (2), the first unsymmetrically substituted dialkylgermylene, which is stable at ambient temperature. In the solid state, the germylene 2 is monomeric, whereas Lappert's germylene [(Me 3 Si) 2 CH] 2 Ge (1) shows a dimeric structure with a Ge=Ge double bond. Steric effects of the additional trimethylsilyl group in 2 are responsible for these drastic changes in the structure. The germylene Me 3 SiCH 2 GeCH(SiMe 3 ) 2 (3) decomposes at about −20 o C
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