N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
238
5 1 H NMR
The silanol hydrogen is exchangeable with D 2 O. Slow intermolecular exchange is
observed in DMSO as solvent so that the vicinal coupling in H–Si–O–H is detectable ( 3 J HSiOH ≈ 2–7 Hz).
Germanium, Tin, and Lead Compounds (δ in ppm, J in Hz)
5.12.2 Phosphorus Compounds
31 P (natural abundance, 100%) has a spin quantum number I of 1/2. Couplings to
protons through up to 5 bonds are usually observed.
Phosphines and Phosphonium Compounds (δ in ppm, J in Hz)
H 3 C Sn
CH 3
CH 3
CH 3
H 3 C Ge
CH 3
CH 3
CH 3
H 3 C Pb
CH 3
CH 3
CH 3
P
H 3 C
H 3 C
CH 3
P
H 3 C
H 3 C
H
H 3 C PH 2
H Si OH
PH 3
H Si
CH 3
CH 3
OH
3 J HSiOH 1.8
(in DMSO)
2 J HC 117 Sn 51.9 (7.6%)
2 J HC 119 Sn 54.3 (8.6%)
3 J HSiOH 2.0
(in DMSO)
0.13
4.42
5.78
5.45
0.07
0.71
P
P
+
I –
1.79
1.20
2.52 1.28
0.96
0.98 2.63
1.06
3.13
0.97
1 J HP 184.9
1 J HP 186.4
2 J HCP 4.1
3 J HCPH 8.2
2 J aP 13.7
3 J bP 0.5
3 J ab 7.6
2 J aP 12.8
3 J bP 18.0
3 J ab 7.6
1 J HP 191.6
2 J HCP 3.6
3 J HCPH 7.7
2 J HCP 2.1
a
a
b
b