Abstract
Reactions of α-stannylvinyllithiums RR′CC(Li)SnMe 3 with halides Me 3MCl (M = Si, Ge, Pb) give the corresponding mixed bis(trimethylmetal)alkenes RR′CC(SnMe 3) 3. With two equivalents of methyllithium and trimethyllead chloride, RR′CC(SnMe 3) 2 can be converted to RR′CC(PbMe 3) 2. The latter, as well as RR′CC(SnMe 3)PbMe 3, undergoes transmetallation with methyllithium to give α-plumbylvinyllithiums RR′CC(Li)PbMe 3 which are more stable and apparently less basic than the corresponding α-stannyl anions. Multinuclear NMR data for the anionic species are presented and discussed.
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