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14 N‐kernresonanzspektroskopische Untersuchungen an o‐substituierten N‐Äthylpyridiniumkationen
Author(s) -
Giger W.,
Schauwecker P.,
Simon W.
Publication year - 1971
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19710540812
Subject(s) - chemistry , chemical shift , heteronuclear molecule , substituent , pyridinium , nitrogen , resonance (particle physics) , computational chemistry , stereochemistry , medicinal chemistry , organic chemistry , nuclear magnetic resonance spectroscopy , atomic physics , physics
In a series of 17 o ‐substituted N‐ethylpyridinium salts the pyridinium nitrogen‐14 chemical shifts were determined by heteronuclear double resonance. A shift range of about 30 ppm was observed. No shift correlation was obtained with total electron densities calculated by the Extended Hückel Theory. By comparison with carbon‐13 shifts in analogously substituted aromatic systems a similar substituent dependence of 14 N and 13 C shifts could be established.