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223 Chapter 21: Amines. Organic derivatives of ammonia, NH 3 . Nitrogen atoms have a lone pair of electrons, making the amine both basic and nucleophilic 21.1: Amines Nomenclature. (please read) Amines are classified according to the degree of nitrogen substitution: 1° (RNH 2 ), 2° (R 2 NH), 3° (R 3 N) and 4° (R 4 N + ) N C H sp 3 N H H H alkylamines arylamines primary (1°) amines secondary (2°) amines tertiary (3°) amines quarternary (4°) ammonium ion NH 2 N H N H 3 CH 2 C N CH 2 CH 3 CH 2 CH 3 H H N H H 3 C N Note: Although the terminology is the same, the classification of amines is different from that of alcohols. 224 21.2: Structure and bonding. The nitrogen of alkylamines is sp 3 hybridized and tetrahedral. The nitrogen of arylamines (aniline) is slightly flatten, reflecting resonance interactions with the aromatic ring.

Chapter 21: Amines. Organic derivatives of ammonia, NH

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Page 1: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 2: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 3: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 4: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 5: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 6: Chapter 21: Amines. Organic derivatives of ammonia, NH
Page 7: Chapter 21: Amines. Organic derivatives of ammonia, NH
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247

C9H13NO [α]D +23°

13C NMR: 138.6, 129.1, 128.5, 126.3, 65.9, 54.2, 40.6

7.21-7.32 (m, 2H) 7.15-7.21 (m, 3H)

3.60 (1H, dd, J= 10.7, 4.1)

3.38 (1H, dd, J= 10.7, 7.0)

3.05-3.12 (1H, m)

2.77 (1H, dd, J= 13.3, 5.0)

2.49 (1H, dd, J= 13.3, 8.8)

2.35-2.45 (3H, br s)

IR:

248

Alkaloids: Naturally occurring compounds that contain a basic nitrogen atom

N

NCH3

nicotine

NH3C

CO2CH3

O Ph

Ococaine

O

HO

NCH3

HH

HO

morphine

NH

N

HO

H3CO

H

quinine

NH2

OCH3

H3CO

H3CO

mescaline

NH

coniine

N

NH

HO2C

H

CH3

lysergic acid

N

CH3

NCH3 CH3

OO

NHH3C

physostigmine

NH

OH

Histrionicotoxin

N

O

N

OH

H

H

H

strychnine

NH

NHO

MeO2C

NMeO

N

HOH

CO2CH3

O

O

RR= -CH3 vinblastineR= -CHO vincristine

CO2H

HONH2 N

H

NH2

tyrosine tryptophan

CO2H NH2

HO

HO

dopamine

HO

NH

NH2

serotonin

124