反应详情

7,8-Dihydroxy-2-oxo-2H-1-benzopyran-3-carboxylic acid (50 mg) was heated under reflux for 5.5 hours in thionyl chloride (20 mL), and then thionyl chloride was distilled off. Benzene (10 mL) was added to the residues, and the benzene was distilled off, followed by vacuum drying, to yield 7,8-dihydroxy-2-oxo-2H-1-benzopyran-3-carbonyl chloride.

1. distillationthionyl chloride was distilled off
2. additionBenzene (10 mL) was added to the residues
3. distillationthe benzene was distilled off
4. customdrying