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Natural abundance proton‐coupled 15 N NMR spectra of pyridines observed from proton polarization transfer experiments
Author(s) -
Jakobsen Hans J.,
Yang P.I.,
Brey Wallace S.
Publication year - 1981
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270170413
Subject(s) - proton , chemistry , coupling constant , spectral line , substituent , pyridine , polarization (electrochemistry) , population , ring (chemistry) , analytical chemistry (journal) , stereochemistry , medicinal chemistry , physics , organic chemistry , nuclear physics , demography , particle physics , astronomy , sociology
Natural abundance proton‐coupled 15 N NMR spectra have been observed for pyridine and a series of mono‐ and disubstituted pyridines using polarization transfer achieved by the selective population transfer method. The magnitudes and signs of the 15 N 1 H spin‐spin coupling constants between the ring‐nitrogen and ring‐protons are determined from complete iterative spectral analysis and/or selective population transfer experiments. Substituent effects on the 15 N 1 H coupling constants are discussed and compared with those for 13 C 1 H couplings in substituted benzenes.