Pigment Yellow 97

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. The 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.^[1]

Arylide yellow pigments are obtained by acetoacetylation of an aromatic amine with diketene, followed by reaction with a diazo component in an azo coupling to form the pigment.^[3][4] Pigment Yellow 97 (6) is produced by diazotization of 4-amino-2,5-dimethoxy-N-phenylbenzenesulfonamide (1) and subsequent coupling of the diazo component (2) with 4-chloro-2,5-dimethoxyacetoacetanilid (5). The coupling component is obtained by reaction of diketene (4) with 2,5-dimethoxy-4-chloroaniline (3).

Pigment Yellow 97 is used in a wide range of applications. In the field of paints, it is suitable for industrial coatings in pastel color shades and for automotive refinish paints used as tinting colors. In emulsion paint, it can also be used for outdoor applications. In the printing ink sector, it is primarily used for high-quality printed products with stringent fastness requirements. Another area of application is plastics, for example in transparent and opaque colorations in rigid PVC. Pigment Yellow 97 is also used for pigmenting epoxy resins and resins based on unsaturated compounds polyesters, as well as printer inks.^[5]