Q. 14.33 - An Introduction to General, Organic, and Biological Chemistry

Question

Classify each of the following amines as primary$\left(1^{\circ }\right)$ , secondary $\left(2^{\circ }\right)$, or tertiary $\left(3^{\circ }\right)$:

a. 

b. 

c.

d.

Step-by-Step Solution

Answer

(part a) The amine in question is a Primary $\left(1^{\circ }\right)$ amine.

(part b) The amine in question is a Secondary$\left(2^{\circ }\right)$ amine.

(part c) The amine in question is a Tertiary$\left(3^{\circ }\right)$ amine.

(part d) The amine in question is a Tertiary$\left(3^{\circ }\right)$ amine.

Step1: Introduction.(part a)

Primary $\left(1^{\circ }\right)$ amines are those in which the nitrogen atom is bound to one alkyl group. Secondary $\left(2^{\circ }\right)$ amines with two alkyl groups bound to the nitrogen atom. Tertiary $\left(3^{\circ }\right)$ amines with three alkyl groups bound to the nitrogen atom.

Step2: Given Information (part a).

To find the amines are primary, secondary or tertiary.

Step3: Explanation (part a).

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2$

It's categorized as a Primary $\left(1^{\circ }\right)$amine. One propyl group is confined to one nitrogen atom in this structure.

Step4: Given Information (part b).

To find the amines are primary, secondary or tertiary.

Step5: Explanation (part b).

It's categorized as a Secondary $\left(2^{\circ }\right)$ amine. The nitrogen atom is bound to one propyl group and one methyl group in this structure.

Step6: Given Information (part c).

To find the amines are primary, secondary or tertiary.

Step7: Explanation (part c).

It's categorized as a tertiary $\left(3^{\circ }\right)$ amine. In this structure the nitrogen atom is bounded to three alkyl groups.

Step8: Given Information (part d).

To find the amines are primary, secondary or tertiary.

Step9: Explanation (part d).

It's categorized as a tertiary $\left(3^{\circ }\right)$ amine. The nitrogen atom is bound to two ethyl groups and one methyl group in this structure.