N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
202
5 1 H NMR
N
N
N
N
S
N
N
H
N
N
N
O
N
N
H
N
b
a
c
b
a
a
b
a
d
a
a
a
a
c
c
b
e
b
b
b
b
d
c
c
c
e
d
c
f
c
d
d
d
f
e
f
d
g
d
6.64
7.14
6.28
7.67
7.60
8.10
7.78
7.95
≈16
7.25
7.83
7.97
8.61
8.08
7.68
8.70
9.21
8.99
13.5
7.13
7.39
6.50
7.42
7.53
7.61
7.66
6.97
7.36
6.31
6.55
7.58
13.1
7.76
8.05
5 J ae 0.8
3 J bc 7.8
4 J bd 1.2
5 J be 1.0
3 J cd 7.0
4 J ce 1.2
3 J de 7.9
3 J ab 8.3
4 J ac 1.0
5 J ad 0.9
3 J bc 7.0
3 J ab 2.7
4 J ac 1.2
5 J ad 0.5
3 J bc 3.9
6 J bf 0.5
5 J cg 1.0
3 J de 9.0
4 J df 1.0
5 J dg 1.2
3 J ef 6.4
4 J eg 1.0
3 J fg 6.8
3 J ab 9.1
4 J ac 1.1
5 J ad 0.9
3 J bc 6.4
3 J ab 8.9
4 J ac 1.2
5 J ad 0.9
3 J bc 6.7
3 J ab 8.4
4 J ac 1.0
5 J ad 0.8
3 J bc 7.0
4 J bd 1.0
3 J cd 7.9
3 J ab 1.2
4 J af 0.7
3 J cd 9.0
4 J ce 1.3
5 J cf 1.3
3 J de 6.6
4 J df 1.3
3 J ef 6.8
(all other coupling constants
negligible)
(in DMSO)
(in DMSO)
(all other coupling constants
negligible)
(all other coupling constants
negligible)
N
N
N
H
N
S
N
N
(chemical shifts in CDCl 3 ,
coupling constants in
acetone)