300
6.4.2 31 P Chemical Shifts of Tetracoordinated Phosphonium Compounds (δ in ppm relative to H 3 PO 4 )
31 P Chemical Shifts of Symmetrically Substituted Phosphonium Compounds, PR 4
+
31 P Chemical Shifts of Triphenylphosphonium Compounds, P(phenyl) 3 R +
Substituent R
δ
–CH 3
25
–CH 2 CH 3
41
–n-propyl
31
Substituent R
δ
–n-butyl
34
–phenyl
23
–OCH 3
5
Substituent R
δ
–CH 3
23
–CH 2 CH 3
26
–CH 2 Cl
24
–CH 2 OH
18
–CH 2 COCH 3
26
–CH 2 COOCH 2 CH 3
21
Substituent R
δ
–CH=CH 2
19
–CH=C=CH 2
19
–C– – – C–phenyl
5
–OCH 2 CH 3
62
–NH 2
36
–N(CH 3 ) 2
48
P
N
N
68
P
27
H
N
P
N
H
21
Heteronuclear NMR Spectroscopy
6