N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
230
5 1 H NMR
5.11.4 Esters and Lactones
1 H Chemical Shifts and Coupling Constants of Carboxylic Acid Esters
(δ in ppm, J in Hz)
O
H
O
H
H
H
O
O
O
O
O
O
H
H
H
3.67
O
O
O
O
O
O
2.31
1.33
O
O
O
O
O
O
F
F
F
O
O
O
O
O
O
O
H
O
CH 3
8.07
8.07
7.33
4.66
4.96
2.01
2.02
2.13
1.15
1.65
7.28
4.56
4.88
2.32
2.22
0.98
3.66
1.20
2.56
1.17
3.67
3.67
4.41
1.61
3.66
0.92
1.40
4.99
1.23
2.04
1.60
2.29
7.08
7.37
7.22
0.94
1.39
4.06
1.45
4.12
4.02 0.95
2.04
1.26
2.05
1.65
3.76
O
O
| 4 J ab | 0.8
4 J ab -0.7
5 J ac 1.6
5 J ad 0.8
3 J bc 6.4
3 J bd 13.9
2 J cd -1.7
a
a
b
b
c
d
O
O
a
b
c
3 J ab 6.3
3 J ac 14.1
2 J bc -1.6
3 J ab 8.2
4 J ac 1.1
5 J ad 0.5
4 J ae 2.5
3 J bc 7.5
4 J bd 1.7
e
d
c
b
a