[F:1][C:2]1[CH:3]=[C:4]([N+:15]([O-])=O)[CH:5]=[CH:6][C:7]=1[S:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.[Mn]([O-])(=O)(=O)=[O:19].[K+].S([O-])([O-])=O.[Na+].[Na+].[OH2:30]>C(O)(=O)C>[F:1][C:2]1[CH:3]=[C:4]([NH2:15])[CH:5]=[CH:6][C:7]=1[S:8]([C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1)(=[O:19])=[O:30]To a stirred solution of 3-fluoro-4-(phenylthio)nitrobenzene (5.65 g, 22.7 mmol) in glacial acetic acid (200 mL) was added potassium permanganate (4.30 g, 27.2 mmol) in distilled water (75 mL). The dark brown mixture was stirred at room temperature for 1 hour, then treated with solid sodium sulfite until the solution clarified. The mixture was diluted with water and filtered to yield an off-white solid. Recrystallization from absolute ethanol yielded the title sulfone (4.80 g, 75%) as an off-white solid; mp 124°-125° C. 1H-NMR (300 MHz, DMSO-d6): 7.68-7.73 (m, 2H, aromatic) 7.79-7.84 (m, 1H, aromatic) 8.00 (d, 2H, J=8.2 Hz, aromatic) 8.28-8.38 (m, 3H, aromatic). MS (CI, CH4): 282 (M+1).
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