Amines and Their Structures
Structure and Bonding of Amines
- Amines Classification: Organic nitrogen compounds classified by alkyl groups attached to N:
- Primary (1°): 1 C—N bond
- Secondary (2°): 2 C—N bonds
- Tertiary (3°): 3 C—N bonds
- Quaternary (4°): No lone pair and has a positive charge.
Health & Medicine: Caffeine and Nicotine
- Caffeine and Nicotine: Stimulants of the central nervous system; contain amine heterocycles and are natural plant alkaloids.
- Morphine: Pain reliever from opium poppy; addictive and requires increasing doses over time.
- Codeine: Less potent and present in smaller amounts.
- Heroin: Derived from morphine; more polar than morphine, making it more soluble and about 2-3 times more potent.
Nomenclature of Amines
- Types of Amines:
- Aniline: Benzene with an NH₂ group.
- Piperidine: 6-membered ring with 1 nitrogen; has H attached.
- Pyrrolidine: 5-membered ring with 1 nitrogen; has H attached.
- Pyridine: Aromatic ring-like structure with one nitrogen.
Physical Properties of Amines
- Boiling points influenced by intermolecular forces:
- Diethyl ether: 38°C
- 1-butanamine: 78°C
- 1-butanol: 118°C
- Intermolecular hydrogen bonding increases boiling points.
Amines as Bases
- Ammonia (NH₃) can gain a proton to become NH₄⁺ (ammonium ion).
- Primary amines behave similarly to ammonia in reactions with acids.
- Tyrosine: Precursor to neurotransmitters, undergoes transformations to produce dopamine and norepinephrine.
- Fluoxetine and Sertraline: Antidepressants relevant to neurotransmitter pathways, featuring complex chemical structural features.