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Two‐Dimensional NMR Studies of Polyene Systems. I. All‐ trans ‐Retinal
Author(s) -
Wernly Jacques,
Lauterwein Jürgen
Publication year - 1983
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.19830660526
Subject(s) - chemistry , polyene , chemical shift , carbon 13 nmr , proton nmr , nuclear magnetic resonance spectroscopy , molecule , carbon 13 nmr satellite , retinal , spectral line , nmr spectra database , two dimensional nuclear magnetic resonance spectroscopy , crystallography , stereochemistry , nuclear magnetic resonance , fluorine 19 nmr , organic chemistry , physics , biochemistry , astronomy
Two‐dimensional (2‐D) NMR results are presented for all‐ trans ‐retinal. 2‐D J ‐resolved 1 H‐NMR separated the multiplets of the olefinic protons and accurately determined their chemical shifts. 2‐D shift‐correlated 1 H‐NMR gave the connectivities between scalar coupled protons. From the observed H,H long‐range couplings the assignment of the methyl resonances was possible. 2‐D J ‐resolved 13 C‐NMR separated overlapping C,H‐multiplets and allowed analysis of the C,H long‐range couplings, 2‐D shift‐correlated 13 C‐NMR related each directly bonded C,H‐pair in this molecule. The potential of 2‐D NMR in resolving and identifying individual resonances in polyene spectra is discussed.