Question

Amides are less basic than amines.

Hint:

The basicity of amines is higher than amides because the lone pair on the nitrogen in amides is less available due to resonance with the carbonyl group.

Answer 1

Amide vs. Amine Basicity Explained

Basicity in nitrogen compounds is determined by the availability of the nitrogen's lone pair for accepting a proton. The difference between amides and amines lies in this availability:

Amides:

• The nitrogen atom in an amide is attached to a carbonyl group (C=O).
• Resonance delocalizes the nitrogen's lone pair with the carbonyl group.
• This resonance decreases the lone pair's availability for protonation.
• Consequently, amides exhibit lower basicity.

Amines:

• Amines do not have an adjacent carbonyl group.
• The nitrogen's lone pair is localized and readily available for protonation.
• This characteristic renders amines considerably more basic than amides.

Summary: Resonance in amides reduces electron density on the nitrogen, thus lowering basicity. Amines, lacking this resonance effect, have a more accessible lone pair, resulting in higher basicity.