283
6.2.4 19 F Chemical Shifts of Allenes and Alkynes (δ in ppm relative to
CFCl 3 , |J FF | in Hz)
F
CF 3
F
H
C C C
H
F
F
H
C C C
H
F
H
H
F
F
| 3 J FF | 2.1
| 4 J FF | 4.3
-176
-107
-273
-261
-203
2 J FF +36.4
F
F
F
F
F
F
3 J FF -132
3 J FF +19.1
2 J FF +124
F
F 3 C
F
N 3
| 3 J FF | 21
| 3 J FF | 127
| 2 J FF | 12
F
F
F
3 J FF -119
3 J FF +33
2 J FF +87
F
F
F
F
3 J FF +73.3
3 J FF -114
Cl
F 3 C
F
CF 3
Cl
F 3 C
CF 3
F
| 5 J FF | 1.3
| 5 J FF | 11.3
6.2 19 F NMR Spectroscopy