[F:1][C:2]1[CH:7]=[CH:6][C:5]([F:8])=[CH:4][C:3]=1[NH:9][NH:10][CH2:11][CH2:12][C:13]#[N:14]>S(=O)(=O)(O)O.O.S([O-])([O-])(=O)=O.[Fe+3].S([O-])([O-])(=O)=O.S([O-])([O-])(=O)=O.[Fe+3].S([O-])([O-])(=O)=O.[Fe+2]>[F:1][C:2]1[CH:7]=[CH:6][C:5]([F:8])=[CH:4][C:3]=1/[N:9]=[N:10]/[CH2:11][CH2:12][C:13]#[N:14]To a solution of 3-(2-(2,5-difluorophenyl)hydrazinyl)propanenitrile (790 mg) in 15 mL of 2N sulfuric acid was added 2.0 g of iron(III) sulfate hydrate. The reaction mixture was stirred at ambient temperature for 30 min as the iron sulfate slowly dissolved and a yellow oil precipitated. The reaction mixture was extracted with ether, and the extracts were washed with water, brine, dried over sodium sulfate, filtered through a plug of silica gel and concentrated to give 710 mg (91%) of (E)-3-((2,5-difluorophenyl)diazenyl)propanenitrile. LCMS (ESI) m+H=196.2. 1H NMR (400 MHz, CDCl3) δ 7.34-7.08 (m, 3H), 4.54-4.31 (m, 2H), 2.99 (t, 2H).
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