反应详情

Nitric acid (70%, 12 ml) was added to the ice-cooled 2-(4-chloro-2-fluoro-5-hydroxyphenyl)-5-trifluoromethylpyridazin-3-one (1.25 g) and stirred at room temperature for 30 minutes. Crushed ice was added. The precipitate was collected by filtration and washed with water to give 1.20 g of the desired product, m.p. 146-8° C.

1. additionCrushed ice was added
2. filtrationThe precipitate was collected by filtration
3. washwashed with water