反应详情

A mixture of pyridine 3,4-dicarboxylic acid (15.0 g) and acetic anhydride (30 mL) is refluxed for two hours. The excess acetic anhydride is removed by distillation and the anhydride is collected and purified by sublimation (123° C. at 3 mm Hg) to yield pyridine 3,4-dicarboxylic acid anhydride as a white solid (10.1 g).

1. temperatureis refluxed for two hours
2. customThe excess acetic anhydride is removed by distillation
3. customthe anhydride is collected
4. custompurified by sublimation (123° C. at 3 mm Hg)