Sulfuric Acid → HCID 12592804, compound

Participants

Reaction Steps

35 parts of 6,7-dimethylisatin are introduced into a solution of 60 parts of potassium peroxydisulfate in 400 parts of 98% strength sulfuric acid at from 5° C. to 10° C. The mixture is then stirred for 10-20 minutes, after which it is poured onto ice. The product is filtered off and dried, giving 34 parts of 5,6-dimethyl-2,3-dioxo-1,4-benzoxazine, of melting point 278°-284° C. (with decomposition).

Provenance & Evidence