反应详情

温度

62.5 °C

A mixture of 3-fluoro-4-nitro-benzaldehyde (9.5; 56.21 mmol) and hydroxylamine hydrochloride (4.29 g; 61.83 mmol) in ethanol (50 mL) was heated at 60-65° C. for 2 hours. The solvent was distilled off. The residue was purified by flash chromatography over silica gel with 10-15% ethyl acetate in light petroleum to give 8 g of the title compound (77.4%); IR (KBr): 3091, 3056, 2501, 2431, 1597, 1513, 1488, 1400 cm−1; MS (m/z): 185 (M++1); 1H NMR (CDCl3) δ: 7.62-7.70 (m, 2H), 8.14-8.19 (m, 1H), 8.24 (s, 1H NH), 11.99 (s, 1H, NHOH).

1. distillationThe solvent was distilled off
2. customThe residue was purified by flash chromatography over silica gel with 10-15% ethyl acetate in light petroleum