[F:1][C:2]1[C:11]([OH:12])=[C:10]([F:13])[CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].C(=O)([O-])[O-].[K+].[K+].Cl[CH:21]([F:23])[F:22].Cl>CN(C)C=O.O.C(OCC)(=O)C>[F:1][C:2]1[C:11]([O:12][CH:21]([F:23])[F:22])=[C:10]([F:13])[CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5]
In 20 ml of N,N-dimethylformamide was dissolved 1.00 g of methyl 2,4-difluoro-3-hydroxy-benzoate, followed by adding thereto 0.88 g of potassium carbonate and then 12 ml of a 6 M solution of chlorodifluoromethane in N,N-dimethylformamide, and the resulting mixture was stirred in a sealed tube at 120-130° C. for 2.5 hours. The reaction mixture was added to a mixed solvent of 100 ml of ethyl acetate and 200 ml of water and the pH was adjusted to 2 with 6N hydrochloric acid, after which the organic layer was separated. The organic layer obtained was washed with a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then distilled under reduced pressure to remove the solvent. The resulting residue was purified by a column chromatography (eluent; n-hexane:ethyl acetate=4:1) to obtain 1.02 g of methyl 2,4-difluoro-3-difluoromethoxybenzoate as colorless crystals.
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