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Konfigurationsbestimmung von geometrischen Isomeren mittels selektiver 13 C{ 1 H}‐NOE‐Differenzspektroskopie
Author(s) -
Neidlein Richard,
Kramer Walter,
Ullrich Volker
Publication year - 1986
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19860690417
Subject(s) - chemistry , heteronuclear molecule , chemical shift , spectroscopy , nuclear magnetic resonance spectroscopy , spectral line , nuclear overhauser effect , ring (chemistry) , stereochemistry , crystallography , organic chemistry , astronomy , physics , quantum mechanics
Application of Selective 13 C{ 1 H}‐NOE Difference Spectroscopy in Determination of the Configuration of ( Z )/( E )‐Isomers Heteronuclear 13 C{ 1 H}‐NOE studies have been performed to elucidate the configuration at the imino double bond in N , N ′‐Dicyanoquinonediimines. Selective low‐power irradiation of the neighbouring ring protons in compounds 1 – 5 increases the signal intensities of CN as well as of the imino‐C‐atoms in the 13 C‐NMR spectra. The increase of signal intensity can easily be detected by the difference spectroscopy. The results of this investigation are in good agreement with a recently published study on the stereochemistry of N , N ′‐Dicyanoquinonediimines, based on the interpretation of 13 C‐chemical shifts.