266
Azines. 15 N Chemical Shifts and Coupling Constants (δ in ppm
relative to CH 3 NO 2 , J in Hz)
Imidates and Amidines. 15 N Chemical Shifts (δ in ppm relative to
CH 3 NO 2 )
Guanidines. 15 N Chemical Shifts (δ in ppm relative to CH 3 NO 2 )
H 2 N
NH 2
N
NO 2
N
N
H
N
N
H
-17.5 (CHCl 3 )
-26.8 (CHCl 3 )
2 J NH +3.6
3 J NH -5.7
NH
O
N
O
NH
N
N
N
N
NH 2
NH
N
-156.4 (DMSO)
-165.8 (CHCl 3 )
-155.5 (DMSO)
-160.2 (CHCl 3 )
-165.4
-158.5
-159.7
-153.9
-307.6
(DMSO)
-309.3
(DMSO)
-308.8
(DMSO)
-298.9
(DMSO)
-297.0 (DMSO)
-302.0
(DMSO)
-315.9 (DMSO)
-238.1
-298.3 (DMSO)
-316.4
-227.2
-10.0
-189.2 -139.0
-286.4
NH
NH 2
H 2 N
O –
NO 2
NO 2
O 2 N
NH 2
+
NH 2
H 2 N
NH
NH
HN
H 2 N
NH 2
N
CN
Heteronuclear NMR Spectroscopy
6