反应详情

4-Phenylurazole (25gm) and anhydrous sodium sulphate were suspended in methylene chloride. The suspension was cooled in ice and nitrogen dioxide was passed in until all the 4-phenylurazole dissolved. The solution was filtered and the solvent removed under reduced pressure. The solid was either used as obtained or purified by sublimation (at 100°C and 10-5 mm of mercury).

1. temperatureThe suspension was cooled in ice
2. dissolutiondissolved
3. filtrationThe solution was filtered
4. customthe solvent removed under reduced pressure
5. customas obtained
6. custompurified by sublimation (at 100°C and 10-5 mm of mercury)