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Studies in the Helicene Series NMR. Evidence of ‘Helicene‐like’ Conformations in the cis 1,2‐Diarylethylenes. Part XVII
Author(s) -
Martin R. H.,
Defay Nicole,
Figeys H. P.,
Lê van K.,
Ruelle J. J.,
Schurter J. J.
Publication year - 1972
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.19720550646
Subject(s) - helicene , chemistry , conformational isomerism , steric effects , nuclear magnetic resonance spectroscopy , stereochemistry , two dimensional nuclear magnetic resonance spectroscopy , chemical shift , cis–trans isomerism , solvent , solvent effects , spectroscopy , molecule , organic chemistry , physics , quantum mechanics
The cis and trans isomers of eight 1,2‐diarylethylenes, precursors of helicenes, have been studied by NMR. spectroscopy. The observed differences in chemical shifts, specific solvent effects and steric effects (bromo derivatives) can be explained by the contribution of ‘helicenelike’ conformers in the cis isomers.