Amines are organic compounds derived from Ammonia (NH₃) by replacing one, two, or all three hydrogen atoms with alkyl (R) or aryl (Ar) groups. They are classified into three types based on the number of hydrogen atoms replaced.
The compound DEET (N,N-Diethyl-meta-toluamide), used in mosquito repellents, is an amide compound related to amines. Many important medicines, including antihistamines and antidepressants, are amine derivatives.
| Type | General Formula | Example |
|---|---|---|
| Primary Amine | R–NH₂ | CH₃NH₂ (Methylamine) |
| Secondary Amine | R₂–NH | (CH₃)₂NH (Dimethylamine) |
| Tertiary Amine | R₃–N | (CH₃)₃N (Trimethylamine) |
R represents an alkyl group (like –CH₃, –C₂H₅).
A Primary Amine has TWO N-H bonds. A Secondary Amine has ONE N-H bond. A Tertiary Amine has ZERO N-H bonds — all three hydrogens of NH₃ are replaced.
The functional group of an amine is **–NH₂** (amino group) for primary amines. This nitrogen-containing group is responsible for the basic character and the properties of amines.
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