Color Index Pigment Yellow 83 is an organic compound that is classified as a diarylide pigment. It is used as a yellow colorant.
The compound is produced industrially from three components: Treatment of 2,5-dimethoxy-4-chloroaniline with diketene gives an acetoacetylated aniline. This compound is then coupled to the bisdiazonium salt obtained from 3,3'-dichlorobenzidine.
Pigment Yellow 83 is a slightly flammable yellow solid that is practically insoluble in water. It decomposes when heated above 300 ðC. It exhibits a crystal structure belonging to the space group P21/c or space group Pc.
As confirmed by X-ray crystallography, the compound exists as a bis(keto-hydrazide) tautomer, not a true diazo compound.
Pigment Yellow 83 is used, for example, as a reddish-yellow pigment in printing inks and plastics.