[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][S:9](Cl)(=[O:11])=[O:10])=[CH:4][C:3]=1[O:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[F-:20].[K+].[F-].C([N+](CCCC)(CCCC)CCCC)CCC.O>C(#N)C>[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][S:9]([F:20])(=[O:11])=[O:10])=[CH:4][C:3]=1[O:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1
The sulfonyl chloride obtained in step 2 (2.0 g, 6.65 mmol) is diluted with acetonitrile (20 mL). The resultant solution is treated with potassium fluoride (1.93 g, 33.25 mmol) and tetrabutylamonium fluoride (0.208 g, 0.66 mmol), stirred at room temperature for one day, poured into water, and extracted with ethyl acetate. The organic extract is washed with water, dried over anhydrous sodium sulfate, and concentrated in vacuo to obtain a residue. Flash chromatography of the residue on silica gel eluting with 15:85 ethyl acetate/hexanes gives (4-fluoro-3-phenoxyphenyl)methanesulfonyl fluoride (0.81 g, mp 59.5-61.5° C.) which is identified by NMR spectral analyses.
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