Sulfuric Acid → Benzenesulfonic acid, 3,4-diamino-

Participants

Reaction Steps

Concentrated sulfuric acid (200 mL) was added to benzene-1,2-diamine (20 g, 184.95 mmol, 1.00 equiv) at −40° C., and the solution was stirred for 30 minutes at room temperature, then overnight at 140° C. in an oil bath. Upon cooling to room temperature, the reaction was quenched by 500 g of ice. The solids were collected by filtration, and the crude product was purified by re-crystallization from water affording 9.8 g (28%) of 3,4-diaminobenzenesulfonic acid as a white solid.

Provenance & Evidence