Substituted 2-benzimidazolinones are commercial dyes and pigments. For example 4-amino-2-benzimidazolinone condenses with diketene to give the acetoacetanilide, which undergoes diazo coupling with various aryldiazonium salts. In this way pigment orange 36 and pigment yellow 154 are produced. These pigments are used in paints and plastics.[3]
The drug domperidone is a derivative of benzimidazolinone.
^Schwiebert, Kathryn E.; Chin, Donovan N.; MacDonald, John C.; Whitesides, George M. (1996). "Engineering the Solid State with 2-Benzimidazolones". Journal of the American Chemical Society. 118 (17): 4018–4029. doi:10.1021/ja952836l.