CHARACTERISTIC PROTON CHEMICAL SHIFTS
Type of Proton |
Structure |
Chemical Shift, ppm |
---|---|---|
Cyclopropane |
C3H6 |
0.2 |
Primary |
R-CH3 |
0.9 |
Secondary |
R2-CH2 |
1.3 |
Tertiary |
R3-C-H |
1.5 |
Vinylic |
C=C-H |
4.6-5.9 |
Acetylenic |
triple bond,CC-H |
2-3 |
Aromatic |
Ar-H |
6-8.5 |
Benzylic |
Ar-C-H |
2.2-3 |
Allylic |
C=C-CH3 |
1.7 |
Fluorides |
H-C-F |
4-4.5 |
Chlorides |
H-C-Cl |
3-4 |
Bromides |
H-C-Br |
2.5-4 |
Iodides |
H-C-I |
2-4 |
Alcohols |
H-C-OH |
3.4-4 |
Ethers |
H-C-OR |
3.3-4 |
Esters |
RCOO-C-H |
3.7-4.1 |
Esters |
H-C-COOR |
2-2.2 |
Acids |
H-C-COOH |
2-2.6 |
Carbonyl Compounds |
H-C-C=O |
2-2.7 |
Aldehydic |
R-(H-)C=O |
9-10 |
Hydroxylic |
R-C-OH |
1-5.5 |
Phenolic |
Ar-OH |
4-12 |
Enolic |
C=C-OH |
15-17 |
Carboxylic |
RCOOH |
10.5-12 |
Amino |
RNH2 |
1-5 |
Updated: July 11, 2023