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NMR studies of methylenebispyridinium derivatives
Author(s) -
Munavalli S.,
Szafraniec L. L.,
Beaudry W.,
Poziomek E. J.
Publication year - 1986
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260240902
Subject(s) - chemistry , chemical shift , substituent , methylene , molecule , resonance (particle physics) , nitrogen , proton , computational chemistry , stereochemistry , organic chemistry , physics , particle physics , quantum mechanics
The methylene proton chemical shifts of thesystem appear to be affected by the synergistic interactions of a combination of various effects. Although it is difficult to single out the origin, transmission and magnitude of these effects, the synergistic interactions pervade the molecule, causing a net displacement of the chemical shifts. The substituent‐produced chemical shifts show a clear trend in their dependence on the nature of the substituents and the Hammett parameters. Strong through‐conjugation between the aromatic nitrogen and resonance donor substituents in the para ‐position is observed.