Primary vs. Secondary Amines 2

What is a primary amine?

Nitrogen is attached to 1 carbon group.

R–NH₂

• R = 1 carbon group

• Nitrogen has 1 carbon group attached

✅ Primary = 1

What is a secondary amine?

Secondary amine

Nitrogen is attached to 2 carbon groups.

R₂NH

• R₂ = 2 carbon groups

• Nitrogen has 2 carbon groups attached

✅ Secondary = 2

What is a tertiary amine?

Nitrogen is attached to 3 carbon groups.

R₃N

• R₃ = 3 carbon groups

• Nitrogen has 3 carbon groups attached

✅ Tertiary = 3

What is the easy way to classify an amine?

Look at the nitrogen (N) and count how many carbon groups are directly attached to it.

1 = Primary
2 = Secondary
3 = Tertiary ✅N is attached to 1 carbon group: CH₃

• So it is a primary amine ✅

Another:

CH₃–NH–CH₃

• N is attached to 2 carbon groups

• So it is a secondary amine ✅

And:

(CH₃)₃N

• N is attached to 3 carbon groups

• So it is a tertiary amine ✅