• In case of Triethylamine, the number of H’s of ammonia replaced by tert-butyl group (an alkyl group) is 3. Hence it is an example of a 3 ^◦ amine (R₃N).

• Other 3 amines, ,

1-methylcyclohexylamine tert-butylamine

N-methylaniline

are secondary (2 ^◦ R₂NH), primary (1^◦ RNH₂) and again secondary (2 ^◦ R₂NH) amines respectively.