256
N
N
N
S
N
N
O
N
N
S
N
N
S
N
O
N
O
a
c
c
a
a
a
b
c
d
a
a
a
a
b
b
b
b
N
N
O
N
N
O
N
S
N
N
S
N
N
S
N
+
N
H
N
O
2 J N,H a
-13.4
2 J N,H b
-10.4
3 J N,H c
1.2
2 J N,H a
-10.5
2 J N,H b
-10.5
3 J N,H c
2.2
2 J N,H a
-14.2
3 J N,H b
-1.9
1 J NH -96.3 (in TFA)
2 J N,H a
-3.0
3 J N,H b
-4.0
2 J N,H a
+0.5
3 J N,H b
-5.3
2 J N,H a
-14.7
3 J N,H b
1.4
2 J N,H a
-10.8
3 J N,H b
-1.5
+34.7
-7.0
+20.9
-98.1
-83.9
-134.8
-134.8
-182.6
(in TFA)
(in FSO 3 H)
+39.2
-4.9
-80.3
-45.3
+11.6
-33.6
-63.1
-165.6
-179.0 (in H 2 O/HCl)
-86.5
-69.7
+57.2
+31.3
-103.4
-74.8
-137.1
-15.5
-56.2
-82.0
b
b
b
N
N
N
N
N
N
N
N
N
N
N
N
N
N
-122.2
+3.2
N
H
N
+
CF 3 COO –
SO 3 F –
SO 3 F –
Cl –
N
H
+
NH +
2 J N a H d -3.7
3 J N b H c -1.1
Heteronuclear NMR Spectroscopy
6