反应详情

4-Methoxyphthalic acid (959 gm., 5.06 m) and acetic anhydride (2 l.) were mixed together and warmed to reflux. After 2 hours at reflux the solution was filtered while hot. The filtrate was cooled to room temperature and then it was cooled at -70° C. overnight. The solid precipitate was recovered by suction filtration, washed with petroleum either (40°-60°) and air dried. wt.=649 gm., m.p. 89°-94° C.

1. temperaturewarmed to reflux
2. temperatureAfter 2 hours at reflux the solution
3. filtrationwas filtered while hot
4. temperatureit was cooled at -70° C. overnight
5. filtrationThe solid precipitate was recovered by suction filtration
6. washwashed with petroleum either (40°-60°) and air
7. customdried