[F:1][C:2]1[CH:3]=[C:4]([C:9]([F:12])([F:11])[F:10])[CH:5]=[C:6]([OH:8])[CH:7]=1.[N+:13]([O-])([OH:15])=[O:14]>C(O)(=O)C.O>[F:1][C:2]1[CH:3]=[C:4]([C:9]([F:10])([F:11])[F:12])[C:5]([N+:13]([O-:15])=[O:14])=[C:6]([OH:8])[CH:7]=15-Fluoro-3-(trifluoromethyl)phenol (1.27 g) was dissolved in acetic acid (3 ml) and water (1.5 ml), and nitric acid (3.0 ml) was added thereto. The reaction mixture was stirred at 50° C. for 30 minutes. After cooling, water was added to the reaction mixture, and the mixture was extracted with ether. The extract was washed with an aqueous saturated sodium bicarbonate solution and water, dried over magnesium sulfate, and concentrated. The residue was purified by column chromatography (developing solution:ethyl acetate-hexane=1:3) to obtain the title compound as oil (0.33 g, 21%).
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