Question

How can I draw the following amides: N-ethylbutanamide, N-propylpentanamide, N,3-dimethylhexanamide?

Answer 1

You draw the base structure, then you add the substituents in the appropriate locations.

1. N-Ethylbutanamide

The base name tells you that this molecule has a four-carbon chain with an amide group.

Its skeleton structure is `"C-C-C-CONH"_2`.

The carbonyl group is automatically `"C-1"`.

A substituent on the `"N"` atom is indicated by the prefix N-.

In this case, we have an ethyl group on the `"N"` atom, so the structure is

(from www.on-select.com)

2. N-Propylpentanamide

Here, we have a five-carbon amide with a propyl group on the `"N"` atom.

The structure is

(from opsin.ch.cam.ac.uk)

3. N,3-Dimethylhexanamide

Here, we have a six-carbon amide with one methyl group on the `"N"` atom and another methyl group on `"C-3"` of the main chain.

The structure is

(from opsin.ch.cam.ac.uk)