[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4](I)[C:3]=1[F:9].[CH3:10][S:11]([O-])(=[O:13])=[O:12].[Na+]>CN(C)C(=O)C.[Cu](I)I>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([S:11]([CH3:10])(=[O:13])=[O:12])[C:3]=1[F:9]1,2-Difluoro-3-iodobenzene (1.70 g; 7.08 mmol), 2.17 g (21.2 mmol) of sodium methanesulfonate and 4.03 g (21.2 mmol) of copper iodide were heated with stirring at 111° C. for 20 hours in 50 ml of N,N-dimethylacetamide. The reaction solution was filtered, chloroform was added to the filtrate and the mixture was washed with a saturated aqueous solution of sodium hydrogen carbonate. The organic layer was dried and concentrated and the resulting residue was purified by a silica gel column chromatography (hexane:ethyl acetate=2:1) to give 987 mg (yield: 72%) of 1,2-difluoro-3-methanesulfonylbenzene as a colorless transparent solution.
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