[CH3:1][C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[C:4]([CH3:9])[C:3]=1[Mg]Br.[Sn:12](Cl)([CH2:21][CH2:22][CH2:23][CH3:24])([CH2:17][CH2:18][CH2:19][CH3:20])[CH2:13][CH2:14][CH2:15][CH3:16]>C1COCC1>[CH2:21]([Sn:12]([CH2:13][CH2:14][CH2:15][CH3:16])([CH2:17][CH2:18][CH2:19][CH3:20])[C:3]1[C:2]([CH3:1])=[CH:7][C:6]([CH3:8])=[CH:5][C:4]=1[CH3:9])[CH2:22][CH2:23][CH3:24]To 2,4,6-trimethylphenylmagnesium bromide (1.0 M in THF, 10.0 mL, 10 mmol, 1.0 equiv) in THF (30 mL) at −78° C. was added nBu3SnCl (3.25 g, 10.0 mmol, 1.00 equiv). After stiffing for 1.0 hr at 23° C., the solvent was removed in vacuo and the residue was purified by fractional distillation to afford 3.68 g of the title compound as a colorless oil (90% yield).
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