293
6.2.12 19 F Chemical Shifts of Natural Product Analogues (δ in ppm
relative to CFCl 3 , J FF in Hz)
O
AcO
AcO
F
AcO
F
-116
O
HO
HO
F
OH
OH
O
HO
HO
OH
F
OH
O
H O
HO
F
F
O H
O
HO
HO
F
OH
F
NH
N
H
O
O
F
N
N
H
NH 2
O
F
COO
–
H 3 N
+
F
COO
–
H 3 N
+
F
OH
COO
–
H 3 N
+
F
COO
–
H 3 N
+
N
F
H
COO
–
H 3 N
+
N
H
F
-113
-137
-125
-122
-146
-139
-151
-205
-150
-222
-235
-150
3 J FF ≈ 12.4
-119
-138
F
AcO
OAc
O
H
AcO
AcO
F
AcO
OAc
O
H
AcO
AcO
-171
-171
3 J FF ≈ 19.5
6.2 19 F NMR Spectroscopy
6.2.12 19 F Chemical Shifts of Natural Product Analogues (δ in ppm
relative to CFCl 3 , J FF in Hz)
O
AcO
AcO
F
AcO
F
-116
O
HO
HO
F
OH
OH
O
HO
HO
OH
F
OH
O
H O
HO
F
F
O H
O
HO
HO
F
OH
F
NH
N
H
O
O
F
N
N
H
NH 2
O
F
COO
–
H 3 N
+
F
COO
–
H 3 N
+
F
OH
COO
–
H 3 N
+
F
COO
–
H 3 N
+
N
F
H
COO
–
H 3 N
+
N
H
F
-113
-137
-125
-122
-146
-139
-151
-205
-150
-222
-235
-150
3 J FF ≈ 12.4
-119
-138
F
AcO
OAc
O
H
AcO
AcO
F
AcO
OAc
O
H
AcO
AcO
-171
-171
3 J FF ≈ 19.5
6.2 19 F NMR Spectroscopy