Thionyl Chloride → 6,7-dihydroxy-2-oxo-2H-1-benzopyran-3-carbonyl chloride
Reaktionsgleichung
[OH:1][C:2]1[C:3]([OH:16])=[CH:4][C:5]2[O:10][C:9](=[O:11])[C:8]([C:12](O)=[O:13])=[CH:7][C:6]=2[CH:15]=1.S(Cl)([Cl:19])=O>CN(C)C=O>[OH:1][C:2]1[C:3]([OH:16])=[CH:4][C:5]2[O:10][C:9](=[O:11])[C:8]([C:12]([Cl:19])=[O:13])=[CH:7][C:6]=2[CH:15]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
A mixture of 6,7-dihydroxy-2-oxo-2H-1-benzopyran-3-carboxylic acid (110 mg), thionyl chloride (5 mL), and dimethylformamide (one drop) was stirred for 2 hours at room temperature. The excess thionyl chloride was distilled off in vacuo. Benzene (20 mL) was added, followed by vacuum distillation and vacuum drying, to yield 6,7-dihydroxy-2-oxo-2H-1-benzopyran-3-carbonyl chloride.