[C:1]([O:4][CH:5]([C:11]1[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=1)[CH2:6][O:7][CH2:8][CH2:9][OH:10])(=[O:3])[CH3:2].[CH3:18][S:19](Cl)(=[O:21])=[O:20].Cl>C(Cl)Cl.C(N(CC)CC)C>[C:1]([O:4][CH:5]([C:11]1[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=1)[CH2:6][O:7][CH2:8][CH2:9][O:10][S:19]([CH3:18])(=[O:21])=[O:20])(=[O:3])[CH3:2]To a mixture of 19.0 g of 1-acetoxy-1-(3-chlorophenyl)-2-(2-hydroxyethoxy)ethane and 95.0 ml of methylene chloride containing 9.1 ml of methanesulfonyl chloride was dropwise added 16.4 ml of triethylamine with ice cooling over 1 hour. The resulting mixture was stirred for 10 minutes at the same temperature and further for 1 hour at room temperature. The reaction mixture was added to a mixture of 50.0 ml of methylene chloride and 50.0 ml of ice water. The resulting mixture was adjusted to pH 2.0 with 6N hydrochloric acid. The organic layer was separated, washed with water and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure to obtain 24.5 g of oily 1-acetoxy-1-(3-chlorophenyl)-2-(2-methanesulfonyloxyethoxy)ethane.
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