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13 C NMR: The stereochemical dependence of 15 N 13 C coupling constants in pyrazoles
Author(s) -
Axenrod T.,
Mangiaracina P.,
Watnick C. M.,
Wieder M. J.,
Bulusu S.
Publication year - 1980
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.1270130309
Subject(s) - geminal , lone pair , coupling constant , carbon 13 , chemistry , crystallography , nitrogen , coupling (piping) , atomic physics , stereochemistry , physics , molecule , materials science , nuclear physics , organic chemistry , metallurgy , particle physics
Geminal 15 N 13 C coupling constants have been measured in a series of 15 N‐enriched 1‒phenyl‒3,5‒dialkyl‐substituted pyrazoles. The importance of the orientation of the nitrogen lone‐pair in determining the magnitude of 2 J ( 15 N 13 C) values is reflected in the enhanced coupling observed for those carbon atoms lying close in space to the lone‐pair electrons.