N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
213
5.8 Alcohols, Ethers, and Related Compounds
213
1 H Chemical Shifts and Coupling Constants of Enols (δ in ppm,
J in Hz)
5.8.2 Ethers
1 H Chemical Shifts and Coupling Constants (δ in ppm, J in Hz)
O
O
H
H
H
H
O
O
H
H
CH 3
H
HO
O
O
O
O
(in CDCl 3 , partly
enolized)
(in CDCl 3 , partly enolized; for the keto form,
see Chapter 5.11.2)
O
CH 3
O
H 3 C
H
H
O
CH 3
O
H 3 C
H
O
CH 3
O
H
H
3 J ab 9.7
3 J bc ≈8
3 J ab 5.1
8.40
≈16
≈16
15.5
2.04
2.04
5.52
16.6
2.14
2.14
2.18
6.16
2.27 1.06
12.45
2.00
16.2
7.90
2.11
5.60
≈9.3
5.04
a
a
b
b
c
O
O
O
O
alk O
O
H
H
H
O
3.24
3.40 1.38
1.54 0.92
3.65
1.13
3.48
1.20
3.34
3.21
6.44
3.88
4.03
3.16
3.34 0.93
1.19
1.59
2 J gem -10.6
3 J vic 6.1
3 J vic 7.0
O
O
a
b
CDCl 3 DMSO D 2 O
a 3.40
3.24
3.37
b 3.55
3.43
3.60
4 J ab 0.3
3 J bc 7.0
3 J bd 14.1
2 J cd -2.0
a
b
c
d