N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
203 203
S
S
O
O
N
N
O
O
O
O
N
N
N N
a
c
b
c
b
a
b
c
a
a
d
c
a
b
c
b
a
a
e
b
d
c
f
d
d
b
b
e
d
d
e
e
f
e
c
c
f
e
f
g
f
a
d
d
g
f
8.92
8.12
7.39
7.55
8.50
9.22
7.27
7.34
6.52
7.19
5.77
6.42
7.82
7.44
7.80
6.58
6.62
8.39
7.46 7.70
6.36
7.88
7.68
6.34
7.42
8.21
7.47
7.72
6.58
6.71
7.12
7.55
6.97
7.23
7.47
7.22
7.60
7.41
7.72
7.51
7.88 7.97
8.15
7.86
5 J ac 1.0
5 J bf 0.5
3 J cd 9.2
4 J ce 1.1
5 J cf 1.1
3 J de 6.4
4 J df 0.9
3 J ef 7.1
3 J ab 7.9
4 J ac 1.5
5 J ad 0.4
3 J bc 7.9
3 J ab 7.8
4 J ac 1.3
5 J ad 1.1
3 J bc 7.1
3 J ab 4.2
4 J ac 1.8
3 J bc 8.2
5 J cg 0.8
3 J de 8.2
4 J df 1.4
5 J dg 0.7
3 J ef 6.9
4 J eg 1.2
3 J fg 8.5
3 J ab 2.2
6 J ad 0.5
5 J bf 0.9
3 J cd 8.9
4 J ce 1.2
5 J cf 1.0
3 J de 6.8
4 J df 1.0
3 J ef 6.9
3 J ab 9.6
3 J cd 7.7
4 J ce 1.6
3 J de 7.4
4 J df 1.1
3 J ef 8.4
3 J ab 6.0
3 J cd 8.0
4 J ce 1.8
5 J cf 0.5
3 J de 7.0
4 J df 1.1
3 J ef 8.4
5 J ac 1.0
5 J ad 0.9
3 J bc 5.8
5 J cg 0.9
3 J de 8.3
4 J df 1.2
5 J dg 0.8
3 J ef 6.9
4 J eg 1.2
3 J fg 8.3
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
5.6 Heteroaromatic Compounds