Sulfuric Acid → 5-Acetamido-2-bromo-4-fluorobenzenesulfonic acid

Participants

Reaction Conditions

Reaction Steps

N-(4-Bromo-2-fluorophenyl)acetamide (173.2 g) was suspended in conc. sulfuric acid (80 ml), and 60% fuming sulfuric acid (340 ml) was dropwise added thereto at 10° to 20° C., followed by stirring at 20° C., for 2 hours. The reaction mixture was dropwise added to ice water (500 g) at 10° to 20° C., and the precipitated crystals were collected by filtration, washed with cold water (400 ml) and dried under reduced pressure to give 175.8 g of 5-(N-acetylamino)-2-bromo-4-fluorobenzenesulfonic acid. M.P., more than 300° C.

Provenance & Evidence