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0 °C

To a solution of 1-acetamido-3,5-bis(trifluoromethyl)benzene (400 mg, 1.37 mmol) in concentrated H2SO4 (3 mL) at 0° C. was added dropwise 70% HNO3 (0.4 mL, Baker). The mixture was stirred at 0° C. for 0.5 h, then at room temperature for 3 h and it was poured into ice water (10 g). The precipitate was collected by filtration, affording 400 mg of crude product which contained two compounds by 1H NMR. It was separated on a column of silica gel, eluted with chloroform, to afford 134 mg of pure 1-acetamido-2-nitro-3,5-bis(trifluoromethyl)benzene as white long needles. mp: 190°-2° C., 1H NMR (CDCl3): δ2.226 (s, 3H), 7.765 (s, 1H), 7.978 (s, 1H); 8.918 (s, 1H).

1. waitat room temperature for 3 h
2. filtrationThe precipitate was collected by filtration
3. customaffording 400 mg of crude product which
4. customIt was separated on a column of silica gel
5. washeluted with chloroform