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Characterization of coupling constants to nitrogen. Carbon‐13 chemical shifts and carbon–nitrogen coupling constants of substituted benzaldoximes
Author(s) -
Danoff Ann,
FranzenSieveking Marcia,
Lichter Robert L.,
FansoFree Samuel N. Y.
Publication year - 1979
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.1270120208
Subject(s) - coupling constant , nitrogen , lone pair , carbon fibers , chemistry , chemical shift , coupling (piping) , computational chemistry , solvent , materials science , organic chemistry , molecule , physics , particle physics , composite number , metallurgy , composite material
Carbon‐13 chemical shifts and 13 C− 15 N coupling constants of substituted benzaldoximes and of two non‐aromatic oximes have been determined. The coupling constants display little variation as a function of the nature or position of substitution, which suggests that perturbations in the π electron distribution have little effect. The values are compared with the markedly different ones reported for mesitaldoxime, and, in conjunction with the observed solvent effects, are discussed within the Schulman‐Venanzi framework for assessing the role of the lone‐pair.