反应详情

温度

0 °C

To a solution of 2-acetamido-5-chlorobenzotrifluoride (890 mg, 3.74 mmol) in concentrated H2SO4 (4 mL) at 0° C. was added dropwise 70% HNO3 (0.5 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 (15 g). The precipitate was collected by filtration, affording 700 mg of crude 2-acetamido-5-chloro-3-nitrobenzotrifluoride. It was crystallized from EtOH/H2O to give 559 mg of pure 2-acetamido-5-chloro-3-nitrobenzotrifluoride as yellow needles. Mp 190°-2° C., 1H NMR (CDCl3): δ2.210 (s, 3H), 7.357 (s, 1H), 7.896 (d, 1H, J=2.1 Hz), 8.105 (d, 1H, J=2.1 Hz).

1. waitat room temperature for 3 h
2. filtrationThe precipitate was collected by filtration