[N+:1]([C:4]1[CH:9]=[CH:8][C:7]([OH:10])=[CH:6][CH:5]=1)([O-:3])=[O:2].[C:11]([Si:15](Cl)([CH3:17])[CH3:16])([CH3:14])([CH3:13])[CH3:12].C(N(CC)CC)C>C(Cl)Cl.CN(C)C1C=CN=CC=1>[C:11]([Si:15]([CH3:17])([CH3:16])[O:10][C:7]1[CH:8]=[CH:9][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=1)([CH3:14])([CH3:13])[CH3:12]4-Nitrophenol (5.6 g, 40 mmol) was dissolved in CH2Cl2 (200 ml) and stirred at room temperature in the presence of tertbutyldimethyl-silyl chloride (7.8 g, 52 mmol), 4-dimethylaminopyridine (0.1 g, 0.8 mmol) and triethylamine (7.2 ml, 52 mmol). After 30 minutes at room temperature, the reaction mixture was washed with H2O (2×200 ml) and the resulting aqueous phases were extracted with CH2Cl2 (100 ml). The combined organic phases were dried over Na2SO4 and concentrated. The residue was chromatographed over silica gel (hexane-ether 9:1) to provide tert-Butyl-dimethyl-(4-nitro-phenoxy)-silane (10 g, 100%) as a yellow solid, m.p. 36°-38° C. and MS: m/e=253 (M+).
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