反应详情

温度

40 °C

In 24 mL of concentrated sulfuric acid is suspended 4.00 g of 3-hydroxy-2-pyrazinecarboxamide. To the suspension is added 3.09 g of potassium nitrate under ice-cooling. The resulting mixture is stirred at 40° C. for 3 hours. The reaction mixture is poured into 240 mL of water, and the deposited crystals are collected by filtration. The crystals thus obtained are suspended in 80 mL of water and heated under reflux for 30 minutes. After cooling, the crystals are collected by filtration to obtain 2.45 g of 3-hydroxy-6-nitro-2-pyrazinecarboxamide.

1. temperaturecooling
2. filtrationthe deposited crystals are collected by filtration
3. customThe crystals thus obtained
4. temperatureheated
5. temperatureunder reflux for 30 minutes
6. temperatureAfter cooling
7. filtrationthe crystals are collected by filtration