[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([OH:9])=[CH:4][C:3]=1[CH3:10].C(N(CC)CC)C.[C:18]([Si:22]([CH3:25])([CH3:24])Cl)([CH3:21])([CH3:20])[CH3:19]>CN(C)C1C=CN=CC=1.ClCCl>[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([O:9][Si:22]([C:18]([CH3:21])([CH3:20])[CH3:19])([CH3:25])[CH3:24])=[CH:4][C:3]=1[CH3:10]4-Bromo-3,5-dimethylphenol (3.5 g), 4-(dimethylamino)pyridine (212 mg) and triethylamine (2.7 mL) are stirred in dichloromethane (25 mL) at 0° C., then tert-butyldimethylchlorosilane (19 mL) is added dropwise. The reaction mixture is warmed to ambient temperature and stirred overnight. The reaction mixture is diluted with dichloromethane, washed with aqueous HCl (1 M, 25 mL) and then with saturated aqueous NaHCO3 (25 mL). The organic phase is dried (MgSO4) and concentrated to give the title compound. Yield: 5.4 g
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