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Pigment Yellow 97 is widely used as a yellow colorant, and is classified as an arylide yellow. It is distinguished by the presence of a sulfonylaminophenyl group, which renders the material particularly insoluble (resistant to migration). It is derived from two fairly complicated precursors. The acetoacetanilide component is made from 2,5-dimethoxy-4-chloroaniline. The azo component is made from a dimethoxyaniline with the sulfonylaminophenyl substituent.he compound is obtained via acetoacetylation of o-tolidine using diketene. The resulting bisacetoacetylated compound is coupled with two equiv of the diazonium salt obtained from 2,4-dichloroaniline. Although it is often depicted as an azo compound, X-ray crystallography shows that the molecule exists as a hydrazide.
References
K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371
Christie, R.; Hill, J.; Rosair, G. (2006). "The crystal structure of CI Pigment Yellow 97, a superior performance Hansa yellow pigment". Dyes and Pigments. 71 (3): 194–198. doi:10.1016/j.dyepig.2005.07.001.
