N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
228
5 1 H NMR
5.11.2 Ketones
1 H Chemical Shifts and Coupling Constants (δ in ppm, J in Hz)
O
O
O
H
H
H
H
H
O
O
O
O
O
H
O
H
H
H
H
H
O
H
H
H
O
O
2.17
1.13
2.60
2.98
1.22
2.93 1.00
1.77
7.96
7.95
1.65
2.40
2.31
1.44
2.70
2.63
2.12
2.93
3.15
7.48
7.21
7.77
8.01
7.37
7.46*
7.59
7.33*
2.08
1.46
0.97
2.17
2.33
1.88
1.71
6.78
1.98
7.95
7.90
7.95
7.46
7.45
7.46
7.42
7.56
7.55
7.57
7.55
2.29
6.30
6.67
5.91
5.82
6.21
6.28
2.14
2.14 2.44
2.13 2.40 0.93
2.14
2.58
3.54
3.03
1.96
* assignment uncertain
1.11
1.22
1.60
1.06
O
O
O
a
a
b
b
c
c
3 J ab 10.7
3 J ac 18.7
2 J bc 1.3
3 J ab 11.0
3 J ac 17.9
2 J bc 1.4
2 J aa,gem -17.5
3 J ab,cis 10.0
3 J ab,trans 6.3
4 J ac,cis
4.2
4 J ac,trans -3.0
2 J bb,gem -11.1
O
O
O
O
O
O
a
b
c