N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
106
4 13 C NMR
4.5.2 Coupling Constants
13 C- 1 H Coupling Constants (|J| in Hz)
13 C- 13 C Coupling Constants (|J| in Hz)
4.5.3 References
[1] P.E. Hansen, 13 C NMR of polycyclic aromatic hydrocarbons. A review, Org.
Magn. Reson. 1979, 12, 109.
1 J ab 57.0
2 J ac 2.5
3 J ad 10.0
1 J ab 44.2
2 J ac 3.1
3 J ad 3.8
4 J ae 0.9
In benzene: In derivatives:
1 J13 CH a
159.0
2 J13 CH b
1.0
1–4
3 J13 CH c
7.6
7–10
4 J13 CH d
-1.3
13
C
H
H
H
H
a
b
c
d
CH 3
a
a
b
b
c
c
d
d
e