[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[C:9]1([O:19][CH2:18]1)[C:10]([F:17])([F:16])[C:11]([O:13]CC)=[O:12].[OH-].[Na+].C(OCC)(=O)C.Cl>C(O)C.O>[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[C:9]1([O:19][CH2:18]1)[C:10]([F:17])([F:16])[C:11]([OH:13])=[O:12]In 11 ml of ethanol was dissolved 1.1 g of ethyl 3-(2,4-difluorophenyl)-3,4-epoxy-2,2-difluorobutyrate. To the resulting solution was dropwise added 4.7 ml of a 1N aqueous sodium hydroxide solution at 5°-10° C. The solution was subjected to reaction at the same temperature for 10 minutes. The reaction mixture was introduced into a mixed solvent consisting of 50 ml of ethyl acetate and 50 ml of water. The resulting solution was adjusted to pH 1.0 with 6N hydrochloric acid. The organic layer was separated, washed with a saturated aqueous sodium chloride solution, and then dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure to obtain 0.99 g of oily 3-(2,4-difluorophenyl)-3,4-epoxy-2,2-difluorobutyric acid.
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