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The ( Z )/( E )‐configurational analysis of isolated double bonds in pheromones and unsaturated fatty acids. The use of 1D and 2D J ‐resolved 1 H CW off‐resonance techniques in 13 C NMR spectroscopy
Author(s) -
Radeglia Reiner,
Poleschner Helmut,
Heydenreich Matthias
Publication year - 1991
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.1260291010
Subject(s) - chemistry , double bond , vicinal , coupling constant , resonance (particle physics) , nuclear magnetic resonance spectroscopy , stereochemistry , decoupling (probability) , computational chemistry , crystallography , organic chemistry , physics , particle physics , control engineering , engineering
The 1 H CW off‐resonance decoupled 13 C NMR spectra of pheromones and unsaturated fatty acids were measured for the determination of the configuration of double bonds of the type CH 2 CH CHCH 2 . The decoupling frequency corresponded to the resonance frequency of the CH 2 protons. The 2nd order splittings in the observed multiplets of the olefinic carbon atoms allow an approximate determination of the vicinal coupling constant between the olefinic protons, and the configurational assignment of the double bond.