[F:1][C:2]1[CH:7]=[C:6]([I:8])[CH:5]=[CH:4][C:3]=1CC([O-])=O.[OH-].[Na+].C(O)(=O)CC(CC(O)=O)(C(O)=O)[OH:18]>CO.O>[F:1][C:2]1[CH:7]=[C:6]([I:8])[CH:5]=[CH:4][C:3]=1[OH:18]To a solution of 2-fluoro-4-iodophenylacetate (500 mg) in methanol (3 ml) was added 1.07 ml of 2N aqueous sodium hydroxide. The reaction solution was stirred at room temperature for 40 minutes, followed by vacuum concentration of the reaction solution. The residue obtained was diluted with water, acidified with 10% aqueous citric acid to pH 4, then extracted with ethyl acetate, and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to afford the title compound as a colorless oil.
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