反应详情

A mixture of ethyl 6-(2-chlorophenyl)-4-oxo-4H-pyran-2-carboxylate (3.9 g) and concentrated hydrochloric acid (40 ml) was heated under reflux for 2 hours. The reactant dissolved on warming and a solid began to precipitate. Water (40 ml) was added to the cooled mixture and the resulting buff solid yielded the title product as off-white needles (mp 241°-246° C. with decomposition).

1. temperaturewas heated
2. temperatureunder reflux for 2 hours
3. dissolutionThe reactant dissolved
4. temperatureon warming
5. customto precipitate
6. additionWater (40 ml) was added to the cooled mixture