What are the classifications of amines?

Amines are categorized based on the number of carbon atoms directly bonded to the nitrogen atom. 

• Primary (1°) amines have an alkyl or aryl group directly attached to the nitrogen. 
• Secondary (2°) amines have two such groups. 
• Tertiary (3°) amines have three. 

Amines can also be categorized as either aliphatic or aromatic based on the type of groups attached to the nitrogen atom. 

• Aliphatic amines have only aliphatic (non-aromatic) groups attached. 
• Aromatic amines have one or more aryl groups attached.