反应详情

After 7-hydroxy-4(4H)-benzopyranone 0.5 g and 3,4-dihydroxybenzaldehyde 0.42 g were added to a mixture of concentrated hydrochloric acid 25 ml and methanol 35 ml, the mixture was refluxed for 2.5 hours and cooled to room temperature, and water 250 ml was added. The mixture was allowed to stand for 18 hours and the precipitated crystals were filtered. The crystals were dried over phosphorous pentoxide for four hours under reduced pressure to obtain the desired compound 0.61 g.

1. temperaturethe mixture was refluxed for 2.5 hours
2. filtrationthe precipitated crystals were filtered
3. dry with materialThe crystals were dried over phosphorous pentoxide for four hours under reduced pressure