反应详情

3-Chloro-2-hydroxy-5-nitropyridine (4.8 g) was added to phosphorus oxychloride (11 ml) and phosphorus pentachloride (4.45 g) and the mixture refluxed overnight. The mixture was then cooled to room temperature and evaporated under reduced pressure. Iced water was added to the mixture and a solid product formed. The solid was removed by filtration, washed with water and air-dried to give 2,3-dichloro-5-nitropyridine (3.94 g).

1. temperaturethe mixture refluxed overnight
2. customevaporated under reduced pressure
3. additionIced water was added to the mixture
4. customa solid product formed
5. customThe solid was removed by filtration
6. washwashed with water
7. customair-dried