Arylide yellow
Arylide yellow, also known as Hansa yellow and monoazo yellow, is a family of organic compounds used as pigments. They are primarily used as industrial colorants including plastics, building paints and inks. They are also used in artistic oil paints, acrylics and watercolors. These pigments are usually semi-transparent yellows and yellow-greens. Related organic pigments are the diarylide pigments. Overall, these pigments have partially displaced the toxic cadmium yellow in the marketplace. Painters such as Alexander Calder and Jackson Pollock are known to have employed arylide yellow in their artworks.Production
The compound is obtained by azo coupling of aniline and acetoacetanilide or their derivatives. The class of compounds was discovered in Germany in 1909.Examples
Members of this class include:
- Pigment Yellow 6, derived from 4-chloro-2-nitroaniline and aniline to produce medium yellows.
- Pigment Yellow 3, derived from 4-chloro-2-nitroaniline and 2-chloroaniline to produce greenish-yellows.
- Pigment Yellow 16 derived from 2,4-dichloroaniline and tolidine to produce medium-yellows.
- Pigment Yellow 74, derived from 2-methoxy-4-nitroaniline and 2-methoxyaniline to produce greenish-yellows.
