N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
4.12 Miscellaneous Compounds
147
4.12.2 Phosphorus Compounds
31 P (natural abundance, 100%) has a spin quantum number I of 1/2. Couplings to
protons through up to 3–4 bonds are usually observed.
Phosphines and Phosphonium Compounds (δ in ppm, |J31 P 13 C | in Hz)
P
+
I
–
P
+
I
–
H 3 C
P
+
H 3 C
CH 3
CH 3
I
–
P
CH 3
CH 3
P
CH 3
CH 3
P
+
Br
–
P
2 J 10
133.7
1 J 55
10.7
2 J 5
6.3
1 J 48
18.7
22.7
1 J 50 24.6
3 J 5
13.8
4 J 0
23.8
2 J 15
1 J 12
32.6
2 J 14
28.9
3 J 10
27.0
4 J 0
26.0
1 J 11
28.6
1 J 16
14.4
3 J 15
24.1
3 J 11
24.5
3 J 12
24.8
1 J 49
12.3
P
PH 2
P
+
Br
–
2 J 10
134.0
2 J 10
134.3
2 J 20
133.6
3 J 7
128.4
4 J 0
128.5
3 J 12
130.7
3 J 13
131.0
3 J 12
130.6
4 J 3
135.6
4 J 3
135.9
4 J 2
135.1
117.3
1 J 90
117.4
1 J 89
1 J 12
137.2
119.1
1 J 80
1 J 12
126.0
130.8
2 J 20
145.5
2 J 0
1 J 86
118.3
23.7
2 J 4
28.3
2 J 14
39.3
1 J 8
1 J 15
11.3
27.9
2 J 15
13.3
4 J 0
13.9
4 J 0
14.0
4 J 0
P
+
Cl
–