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Coupling constants in N ‐substituted pyridines and their relation with electronegativity
Author(s) -
Katritzky Alan R.,
Kinns Michael,
Lunt Edward
Publication year - 1975
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.1270071110
Subject(s) - electronegativity , substituent , ring (chemistry) , coupling constant , pyridine , chemistry , coupling (piping) , electron , computational chemistry , atomic physics , crystallography , physics , medicinal chemistry , materials science , quantum mechanics , organic chemistry , metallurgy
The coupling constants obtained from the complete spectral analysis of series of 1‐ and 3‐substituted pyridine N ‐imides are related linearly to the electronegativities of the substituent atoms. The main conclusions of the papers by Cox, Castellano and Sun, and Castellano and Kostelnik are substantiated. The inductive effects of the first atoms of the substituents largely determine the coupling between protons in the ring system; delocalisation of π‐electrons in the ring produces a much smaller effect.