[C:1]([O:4][C:5]1[C:14]([O:15][C:16](=[O:18])[CH3:17])=[C:13]2[C:8]([C:9](=[O:22])[C:10]([C:19](O)=[O:20])=[CH:11][O:12]2)=[CH:7][CH:6]=1)(=[O:3])[CH3:2].S(Cl)([Cl:25])=O.C1C=CC=CC=1>CN(C)C=O>[C:1]([O:4][C:5]1[C:14]([O:15][C:16](=[O:18])[CH3:17])=[C:13]2[C:8]([C:9](=[O:22])[C:10]([C:19]([Cl:25])=[O:20])=[CH:11][O:12]2)=[CH:7][CH:6]=1)(=[O:3])[CH3:2]A mixture of 7,8-diacetoxychromone-3-carboxylic acid (9.5 g), thionyl chloride (2.6 ml), dimethylformamide (0.1 ml) and benzene (300 ml) was refluxed for one and half hours, and there were further added thionyl chloride (2.6 ml) and dimethyl formamide (0.1 ml). The whole was then refluxed for further one hour. Then the solvent was removed therefrom by distillation, and the residue was triturated with n-bexane. The solid matter thus obtained was collected by filtration. There was thus obtained the desired product (9.3 g).
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