Reactions of α-stannylvinyllithiums RR′CC(Li)SnMe3 with halides Me3MCl (M = Si, Ge, Pb) give the corresponding mixed bis(trimethylmetal)alkenes RR′CC(SnMe3)3. With two equivalents of methyllithium and trimethyllead chloride, RR′CC(SnMe3)2 can be converted to RR′CC(PbMe3)2. The latter, as well as RR′CC(SnMe3)PbMe3, undergoes transmetallation with methyllithium to give α-plumbylvinyllithiums RR′CC(Li)PbMe3