Thionyl Chloride → HCID 53808777, compound

Participants

Reaction Steps

2.5 g of thionyl chloride is added to a suspension of 4.5 g of sodium 5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylate in 35 ml of carbon tetrachloride with stirring, and the mixture is stirred under reflux for 3 hours. After cooling, the crystals are filtered off, washed with cool water and then with acetone, and dried to give 5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylic acid chloride melting at 234°-235°C.

Provenance & Evidence