[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]2[O:11][CH:10]2[C:12]([O:14]C)=[O:13])[CH:5]=[CH:6][C:7]=1[Cl:8].[OH-].[Na+]>CO>[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]2[O:11][CH:10]2[C:12]([OH:14])=[O:13])[CH:5]=[CH:6][C:7]=1[Cl:8]To a solution of methyl (2RS,3SR)-3-(3,4-dichlorophenyl)oxirane-2-carboxylate (90.9 g) in methanol (500 ml) was added 4 N sodium hydroxide solution (138 mL), and the mixture was stirred at room temperature for 2 hr. The reaction solution was filtered and washed with methanol. To the mother liquor was added 3 N hydrochloric acid (400 ml), and the mixture was stirred at room temperature for 1 hr. The resultant product was collected by filtration, and washed with distilled water to give the title compound (57.3 g).
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