N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
227
5.11 Carbonyl Compounds
227
5.11 Carbonyl Compounds
5.11.1 Aldehydes
1 H Chemical Shifts and Coupling Constants (δ in ppm, J in Hz)
CHO
CHO
H 3 C
H
CHO
H
O
H
CHO
O
H
alk CHO
alken CHO
CHO
R
CH 2 O
CHO
CHO
9.60
10.24
9.95
11.54
2.64
7.23
7.33
7.32
7.56
7.45
2.42
7.77
7.76
7.69
8.99
8.07
8.71
2.20
9.57
9.59
6.37
7.43
9.67
6.69
7.53
7.4
7.4
6.52
6.35
2.39
1.13
1.13
1.08
1.67
1.59
0.93
2.46
0.97
1.35
2.42
2.42
9.79
9.79
9.48
9.74
9.76
(in TMS)
| 2 J gem | 42.4
3 J ab 3.0
3 J ab 1.1
3 J ab 1.4
3 J ab 2.0
3 J ab 1.9
9–10
9–10
ortho-substituted: 10–10.5
meta-, para-substituted: 9.5–10.2
3 J vic 0–3
3 J vic ≈8
a
a
a
a
a
b
b
b
b
b
CHO
H
H
H
O
H
10.03
7.88
7.53
7.63
O
H
O
H
3 J ab 4.7
4 J ac <1
4 J ad <1
3 J bc 10.0
4 J bd 17.4
2 J cd 1.0
3 J ab 7.8
3 J bc 16.0
a
b
c
d
a
b
c