An aromatic amine is an amine that is attached to an aromatic hydrocarbon via an aromatic substituent. Aromatic amines have a chemical structure that contains at least one benzene ring.
There are three types of aromatic amines: monocyclic, polycyclic and heterocyclic. Aromatic amines are a by-product in the production of polyurethane, industrial dyes, pharmaceuticals, pesticides and semiconductors. Aromatic amines can be found in the smoke of burning wood, rubber and tobacco. Diesel exhaust also contains levels of aromatic amines. When an aromatic amine undergoes protonation, it becomes more acidic. According to the Breast Cancer Fund, aromatic amines play a contributing role in the development of some cancers.