The aromatic amines are an industrially important class of organic compounds being widely used in the production of compounds and intermediates for the dyestuff, rubber-processing, and drug-manufacturing industries. Most aromatic amines possess the expected basic character that results from the presence of the lone pair of electrons on the nitrogen atom and like the aliphatic amines, they usually form stable salts with inorganic and also with many organic acids. Aromatic amines are highly reactive and can undergo a variety of chemical reactions, including acylation, alkylation, and nitration. They can also be used as catalysts in various chemical reactions.