Sulfuric Acid → 1,2,3,4-Tetrahydro-2,3-dioxo-6-quinoxalinesulfonic acid

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Reaction Steps

2,3(1H, 4H)-Quinoxalinedione (10 g) was added portionwise to a stirred mixture of 65% fuming sulphuric acid (10 ml) and conc. sulphuric acid (40 ml) at room temperature. After stirring for 30 minutes at 55°-60°, the mixture was worked up as in example 1 to give the hydrated crystalline product (15.3 g, mp. >300°).

Provenance & Evidence