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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 acetoacetylanilide 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.

References

1. K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371

• Organic pigments
• Shades of yellow
• Chloroarenes
• Diarylide pigments