Sulfuric Acid → HCID 21184353, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2 g (8.84 mmol) of 4,9-dihydro-4,9-dioxo-1,2-dimethyl-1H-naphtho[2,3-d]imidazole in 300 mL of a methanol/dichloromethane mixture (2/1) heated at 70° C., 1 mL of concentrated sulfuric acid is added. The reaction mixture is stirred at 70° C. for 2 h, then concentrated at reduced pressure, and the pale yellow precipitate that appears is filtered and washed with dichloromethane, then with ethyl ether, to produce 2 g of 4,9-dihydro-4,9-dioxo-1,2-dimethyl-1H-naphtho[2,3-d]imidazole sulfate, in the form of yellow crystals.

Provenance & Evidence