[Si:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH2:13]O)=[CH:11][C:10]=1[Cl:17])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C(Br)(Br)(Br)[Br:19].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C(Cl)Cl>[Si:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH2:13][Br:19])=[CH:11][C:10]=1[Cl:17])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]To a stirred and cooled (0° C.) solution of 4.00 g (14.1 mmol) of the product of Step B dissolved in 70 mL of CH2Cl2 was added 5.84 g (17.6 mmol) of carbon tetrabromide and 4.61 g (17.6 mmol) of triphenylphosphine. After the addition the reaction mixture was allowed to warm to room temperature and was stirred 3 hours. The mixture was then evaporated in vacuo and purified on a silica gel flash chromatography column eluted with 2% ethyl acetate/hexane to afford 4.50 g (92%) of the title compound.
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