291
6.2.10 19 F Chemical Shifts of Carbonyl and Thiocarbonyl Compounds
(δ in ppm relative to CFCl 3 )
Substituent R
δ
–H
+41
–CH 3
+49
–C(CH 3 ) 3
+22
–CH 2 F
+26
–CF 3
+15
–CF(CF 3 ) 3
+31
–CH=CH 2
+24
Substituent R
δ
–phenyl
+17
–F
-23
–NH–CH 2 CH 2 CH 3
-16
–O–cyclohexyl
-8
–O–phenyl
-17
–S–phenyl
+47
S
F
F
S
F
F 3 C
+41
-75
+53
O
F 3 C
CF 3
O
H
O
O
F -187
-77
O
F 3 C
O
N
O
F 3 C
O
H
N
-77
-81
O
F
R
6.2 19 F NMR Spectroscopy
6.2.10 19 F Chemical Shifts of Carbonyl and Thiocarbonyl Compounds
(δ in ppm relative to CFCl 3 )
Substituent R
δ
–H
+41
–CH 3
+49
–C(CH 3 ) 3
+22
–CH 2 F
+26
–CF 3
+15
–CF(CF 3 ) 3
+31
–CH=CH 2
+24
Substituent R
δ
–phenyl
+17
–F
-23
–NH–CH 2 CH 2 CH 3
-16
–O–cyclohexyl
-8
–O–phenyl
-17
–S–phenyl
+47
S
F
F
S
F
F 3 C
+41
-75
+53
O
F 3 C
CF 3
O
H
O
O
F -187
-77
O
F 3 C
O
N
O
F 3 C
O
H
N
-77
-81
O
F
R
6.2 19 F NMR Spectroscopy