Sulfuric Acid → Benzenesulfonic acid, 4-amino-2,5-dimethyl-

Participants

Reaction Steps

To 121 g of 2,5-dimethylaniline, 100 g of sulfuric acid (d=1.84) was gradually added dropwise and the mixture was heated at 220° to 230° C. on an oil bath for 5 hours. To the reaction mixture, 2 l of an 1 N aqueous potasium hydroxide solution was added and the mixture was stirred with heating. After filtering the mixture while hot, 1 kg of hydrochloric acid (d=1.18) was added to the filtrate. The crystals thus precipitated were collected by filtration and washed with 1 l of acetone.

Provenance & Evidence