Sulfuric Acid → HCID 21559729, compound

Participants

Reaction Steps

A mixture of 25.0 g (0.097 mol) of ethyl 3-cyano-7-hydroxy-4-oxo-4H-1-benzopyran-2-carboxylate in 230 ml conc. sulfuric acid was stirred at room temperature overnight. The mixture was then poured into 1.5 l of ice water with stirring. The resulting solid was filtered off, washed with water, and dried. 16.5 g (60%) mp > 320° C. from acetonitrile.

Provenance & Evidence