Sulfuric Acid → HCID 12592800, compound

Participants

Reaction Steps

32.2 parts of 7-methylisatin are introduced into a solution of 56 parts of potassium peroxydisulfate in 450 parts of 92% strength sulfuric acid at from 0° C. to 10° C. The mixture is then stirred for a few minutes, after which it is poured onto ice. The product is filtered off and dried, giving 31.4 parts of 5-methyl-2,3-dioxo-1,4-benzoxazine, of melting point 247°-249° C.

Provenance & Evidence