PROCESS FOR THE PREPARATION OF 4-NITRO-4'-AMINO-DIPHENYL-AMINO-2-SULFONIC ACID AND 2-NITRO-4'-AMINO-DIPHENYL-AMINO-4-SULFONIC ACID

摘要

4-Nitro-4'-amino-diphenylamine-2-sulfonic acid, 2-nitro-4'-amino-diphenylamine-4-sulfonic acid and their sodium salts are obtained in good yield and high purity by condensing 6- or 4-chloro-3-nitro-benzene sulfonic acid and 1,4-phenylene diamine in a saturated aqueous sodium chloride solution. The products and their desulfonation derivatives are dye precursors.