Sulfuric Acid → 4-Amino-2-chlorobenzenesulfonic acid

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Reaction Steps

3-Chloroaniline, 0.4 ml, was slowly added to 4 ml of fuming sulfuric acid and stirred at room temperature overnight. While cooling to 0°, the reaction solution was poured onto water and the solid precipitated was separated by filtration. The solid filtered off was dissolved in 2N sodium hydroxide aqueous solution and conc. hydrochloric acid was then added to the solution to make the liquid acidic. The solid precipitated was taken by filtration to give the crude product of 4-amino-2-chlorobenzenesulfonic acid.

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