N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
204
5 1 H NMR
3 J ab 8.4
4 J ac 1.6
5 J ad 0.9
3 J bc 4.2
5 J df 0.9
3 J ef 5.6
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
O
N
O
a
c
b
c
b
a
c
a
b
c
a
b
d
c
d
d
a
b
b
a
b
b
b
c
c
c
c
e
d
e
c
d
b
f
f
f
a
a
a
a
d
d
d
e
d
e
e
e
f
e
e
f
f
g
f
f
g
8.55
7.77
7.32
7.68
8.14
8.78
8.01
7.86
7.95
8.44
7.93
8.06
9.41
9.29
8.18
9.35
7.90
8.13
9.66
8.85
7.58
7.52
8.40
8.28
8.26
8.21
9.28
7.72
7.67
7.50
9.14
9.13
7.85
8.76
7.93
7.93
9.44
7.72
7.68
7.79
8.97
9.10
8.73
7.62*
7.93*
7.79
7.60*
7.67*
* assignment uncertain
* assignment uncertain
8.77
7.79
3 J ab 5.9
5 J bf 0.8
3 J cd 7.8
4 J ce 1.5
5 J cf 0.8
3 J de 6.9
4 J df 1.3
3 J ef 8.6
4 J ab 0.0
5 J bf 0.5
3 J cd 8.0
4 J ce 1.3
5 J cf 0.9
3 J de 7.0
4 J df 1.3
3 J ef 8.6
3 J ab 6.1
4 J ac 1.0
3 J bc 8.5
5 J cg 0.9
3 J de 8.2
4 J df 1.2
5 J dg 0.3
3 J ef 7.2
4 J eg 1.4
3 J fg 8.6
3 J cd 8.4
4 J ce 1.4
5 J cf 0.7
3 J de 6.9
3 J ab 8.0
4 J ac 1.8
5 J ad 0.6
3 J bc 4.1
5 J ac 0.4
3 J cd 8.2
4 J ce 1.2
5 J cf 0.6
3 J de 6.8
3 J ab 8.2
4 J ac 1.9
5 J ad 0.9
3 J bc 4.1
3 J de 6.0
5 J df 0.9
3 J ab 8.2
4 J ac 2.0
3 J bc 4.3
4 J ab 1.7
3 J bc 7.0
(all other coupling constants
negligible)
(all other coupling constants
negligible)
(all other coupling constants
negligible)