Disperse Yellow 42, or 4-anilino-3-nitrobenzenesulfonanilide, is a disperse dye that is primarily used to dye polyester fibers. It is prepared by the reaction of two equivalents of aniline with 4-chloro-3-nitrobenzenesulfonyl chloride. An estimated 10,000 tons were prepared in 1990, making Disperse Yellow 42 the nitro dye produced on the largest scale.[1][2]
^Freeman, Harold S.; Posey, James C. (1992). "An approach to the design of lightfast disperse dyes-analogs of disperse yellow 42". Dyes and Pigments. 20 (3): 171–195. doi:10.1016/0143-7208(92)80044-N.