反应详情

温度

15 °C

The aminoxanthone from step (C) (14.4 g) was dissolved in concentrated sulphuric acid (250 ml) and to the stirred solution at 10°-15° C. was added in portions sodium nitrite (3.6 g). The solution was then stirred at 15° C. for 1 hr, poured on to ice (2 kg) and water (2.5 l). The mixture was slowly brought to the broil and boiled under reflux for 1 hr. The resulting yellow product was filtered off, washed well with water and dried.

1. temperatureunder reflux for 1 hr
2. filtrationThe resulting yellow product was filtered off
3. washwashed well with water
4. customdried