Nitric Acid → 4-Bromo-2-fluoro-5-nitroaniline

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Reaction Steps

To a solution of 4-bromo-2-fluoroaniline (58.6 g) in conc. sulfuric acid (100 ml), there is dropwise added a mixture of conc. nitric acid (25.3 g) and conc. sulfuric acid (15 ml) at a temperature of 0° to -10° C. The resultant mixture is stirred at 0°-5° C. for 1 hour, poured into ice-water and extracted with toluene. The toluene layer is washed with water and an aqueous sodium hydrogen carbonate solution and concentrated. The residue is purified by silica gel chromatography to give 16.4 g of 4-bromo-2-fluoro-5-nitroaniline. M.P., 90°-92° C.

Provenance & Evidence