Sodium Dithionite → HCID 12389021, compound

Participants

Reaction Steps

Sodium dithionite (20g) was added to a stirred suspension of 3-nitro-7-methoxy-4H-1-benzopyran-4-one (7.0 g, 0.0316 m) in absolute ethanol (80 ml) and water (30 ml). The reaction mixture was stirred under nitrogen for 20 min. The solvents were removed under reduced pressure to give a solid residue. The residue was dissolved in water and extracted with chloroform. The chloroform extracts were dried over sodium sulfate and evaporated to give 3-amino-7-methoxy-4H-1-benzopyran-4-one (4.5 g, 78.5%), m.p. 143°-146°.

Provenance & Evidence