Thionyl Chloride → HCID 20448118, compound

Participants

Reaction Steps

6,7-Dihydroxy-4-oxo-4H-1-benzothiopyran-3-carboxylic acid (100 mg) was heated under reflux for 2 hours in thionyl chloride (5 mL), and then the thionyl chloride was distilled off. To the residue was added benzene (20 mL). Benzene was distilled off again and the residue was vacuum dried to give 6,7-dihydro-4-oxo-4H-1-benzothiopyran-3-carbonyl chloride.

Provenance & Evidence