反应详情

To a suspension of 2,3-dichloro-4,5-difluoroaniline (0.88 g) in 42% fluoroboric acid (10 ml) with stirring vigorously was added sodium nitrite (0.43 g) in water (1 ml) at -15° to 0° C. for 14 minutes. After stirred for 3 hours at the same temperature, the resulting precipitate was collected by filtration, washed with 42% fluoroboric acid and then with ether to give the title compound (0.66 g) as white powdery crystals, mp 211° C. (decompd.).

1. stirringAfter stirred for 3 hours at the same temperature
2. filtrationthe resulting precipitate was collected by filtration
3. washwashed with 42% fluoroboric acid