反应详情

A mixture of 6,7-diacetoxychromone-3-carboxylic acid (18.4 g, 60 mmol), benzene (450 ml), thionyl chloride (8.6 g, 72 mmol) and N,N-dimethylformamide (3 ml) was refluxed for one hour and cooled to room temperature. After the addition of n-hexane (300 ml), the resulting precipitate was filtered off to give the desired compound (17.6 g).

1. temperaturewas refluxed for one hour
2. filtrationthe resulting precipitate was filtered off