Sulfuric Acid → HCID 12669655, compound

Participants

Reaction Steps

A mixture of 5 parts of 3,9-dihydro-3,9-dioxo-2H-indeno-[2,1-c]pyridine-4-carbonitrile, 46 parts of concentrated sulfuric acid, and 1 part of water is heated at 60°-65° for 41/2 hours, then slowly diluted with 200 parts of water. The copious precipitate which forms is filtered off, washed with water, and crystallized from acetic acid to give 3,9-dihydro-3,9-dioxo-2H-indeno[2,1-c]pyridine-4-carboxamide melting above 300°. The product has the formula ##STR16##

Provenance & Evidence