[C:1]1([CH3:9])[CH:6]=[CH:5][C:4]([Mg]Br)=[CH:3][CH:2]=1.[CH3:10][Sn:11](Cl)([CH3:13])[CH3:12].[Cl-].[NH4+].O>O1CCCC1>[C:1]1([CH3:9])[CH:6]=[CH:5][C:4]([Sn:11]([CH3:13])([CH3:12])[CH3:10])=[CH:3][CH:2]=1p-Tolylmagnesium bromide solution (Aldrich) (1.0M solution in diethyl ether) (53 ml, 0.0530 mol) was added dropwise to trimethyltin chloride (6.92 g, 0.0347 mol) in tetrahydrofuran (50 ml) under nitrogen at -10° C. The suspension was allowed to warm slowly to room temperature over 3 h then saturated ammonium chloride solution (10 ml) was added followed by sufficient water to dissolve the precipitate. The solution was extracted three times with diethyl ether-hexane (1:1). The combined organic phase was washed with brine, dried (magnesium sulfate) and the solvents removed in vacuo. Vacuum distillation of the residue afforded a colorless liquid (39°-40 ° C., 0.1 mm Hg) which was further purified by flash chromatography (silica gel, hexane) to give p-tolyltrimethyltin as a colorless liquid.
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