N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
201 201
5.6.2 Condensed Heteroaromatic Rings
1 H Chemical Shifts and Coupling Constants (δ in ppm, |J| in Hz)
S
N
N
H
N
O
N
S
N
H
O
a
a
a
a
a
a
b
b
b
c
c
b
c
b
b
d
d
c
d
c
c
d
d
e
e
d
e
e
e
f
f
e
f
g
7.54
7.42
8.08
12.5*
7.05
8.10
8.97
7.81
6.69
7.33
6.52
7.55
7.82
7.70
7.64
7.79
7.94
7.20
7.36
7.26
7.12
7.41
7.51
7.25
7.33
7.26
7.18
7.34
7.46
7.47
7.88
7.70
7.27
7.58
8.14
3 J ab 2.5
5 J bf 0.9
3 J cd 7.9
4 J ce 1.2
5 J cf 0.8
3 J de 7.3
4 J df 0.9
3 J ef 8.4
3 J ab 5.5
5 J bf 0.8
3 J cd 8.0
4 J ce 1.1
5 J cf 0.9
3 J de 7.2
4 J df 1.0
3 J ef 8.0
3 J bc 8.2
4 J bd 1.4
5 J be 0.7
3 J cd 7.1
3 J ab 3.1
3 J ag 2.5
5 J bf 0.7
4 J bg 2.0
3 J cd 7.8
4 J ce 1.2
5 J cf 0.9
5 J cg 0.8
3 J de 7.1
4 J df 1.3
3 J ef 8.1
5 J ab 0.2
6 J ac -0.1
6 J ad 0.4
5 J ae 0.0
3 J bc 8.2
4 J bd 1.0
5 J be 0.7
3 J cd 7.4
4 J ce 1.2
3 J de 8.3
5 J ab 0.1
6 J ac -0.2
6 J ad 0.4
5 J ae 0.1
3 J bc 8.2
4 J bd 1.1
5 J be 0.6
3 J cd 7.2
4 J ce 1.1
3 J de 8.2
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(chemical shifts in CDCl 3 ,
coupling constants in
acetone)
(chemical shifts in CDCl 3 ,
coupling constants in
acetone)
(chemical shifts in CDCl 3 ,
coupling constants in
acetone)
* in DMSO
5.6 Heteroaromatic Compounds