6 Heteronuclear NMR Spectroscopy
6.1 15 N NMR Spectroscopy
6.1.1 Heteroaromatic Compounds
Non-condensed Heteroaromatic Rings. 15 N Chemical Shifts and Coupling Constants (δ in ppm relative to CH 3 NO 2 , J in Hz; solvent DMSO,
unless indicated otherwise)
N
N
CH 3
N
N
H
N
N
CH 3
N
N
H
N
H
N
N N
CH 3
N
N N
CH 3
N
N
N
CH 3
N
N
N
CH 3
a
c
a
b
b
b
c
d
e
a
-48.9
-130.7
-70.2
1 J N,H -96.5
2 J N,H a
-4.5
3 J N,H b
-5.3
-229.3
-173.2
-80.1
-224.2
-208.2
(H 2 O)
-176.0
(H 2 O,
pH 10.4)
-182.9
(H 2 O, pH 1.1)
-169.0
-169.0
-218.0
-117.5
2 J N a ,H b
-7.6
3 J N b ,H c
-3.4
2 J N a ,H b
-10.8
2 J N a ,H e
-9.0
2 J N c ,CH 3
-7.6
2 J N c ,H d
-5.5
-127.4
N
CH 3
N
N
–
-177.0
-127.4
-134.7
-142.3
-69.0 -27.2
-69.0
-14.8
-75.9
-170.9
-127.0
-81.3
-59.3
-98.7
-98.7
-5.8
-5.8
-216.8
N
N
N N
H
N
H
NH
+
Cl –
NH
N
H
+
Cl –
NH
N N
NH
N
N
© The Author(s), under exclusive license to Springer-Verlag GmbH, DE,
part of Springer Nature 2020
E. Pretsch et al., Structure Determination of Organic Compounds,
https://doi.org/10.1007/978-3-662-62439-5_6
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