[Cl:1][C:2]1[CH:3]=[C:4]([C:9](=[O:13])[CH2:10][CH2:11][OH:12])[CH:5]=[CH:6][C:7]=1[Cl:8].C(N(CC)CC)C.[C:21]([Si:25]([CH3:28])([CH3:27])Cl)([CH3:24])([CH3:23])[CH3:22].O>CN(C)C=O>[Si:25]([O:12][CH2:11][CH2:10][C:9]([C:4]1[CH:5]=[CH:6][C:7]([Cl:8])=[C:2]([Cl:1])[CH:3]=1)=[O:13])([C:21]([CH3:24])([CH3:23])[CH3:22])([CH3:28])[CH3:27]In 460 ml of dimethylformamide, 46.0 g (0.21 mole) of the 3-(3,4-dichlorophenyl)-3-oxo-1-propanol obtained in Referential Example 4(a) were dissolved, followed by the addition of 35 ml (0.25 mole) of triethylamine and 38.0 g (0.25 mole) of tert-butyldimethylchlorosilane under ice-cooling. The resulting mixture was stirred at 0° C. for 2 hours. The reaction mixture was poured into water and the mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure to give a residue, which was purified by chromatography on a silica gel column (eluting solvent: n-hexane: ethyl acetate=96:4), whereby 66.1 g of the title compound were obtained as white crystals.
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