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28.40 g (0.131 mol) of 3-bromo-5-nitroaniline were dissolved in 250 ml of pyridine and treated with 30 ml (0.317 mol) of acetic anhydride. The mixture was stirred at room temperature for 18 hrs. and subsequently at 40° C. for 2 hrs. Then, the residue was digested in water and the precipitate was filtered off. The filter material was rinsed with a large amount of water and dried at 45° C. in a high vacuum. There were obtained 31.0 g (91.5%) of N-(3-bromo-5-nitrophenyl)-acetamide as orange-yellow crystals. MS (ISP): me/e=260, 258 (C8H8BrN2O3+).

1. waitand subsequently at 40° C. for 2 hrs
2. filtrationthe precipitate was filtered off
3. washThe filter material was rinsed with a large amount of water
4. customdried at 45° C. in a high vacuum