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Two-Dimensional NMR Studies of Polyene Systems. I. All-trans-Retinal

✍ Scribed by Jacques Wernly; Jürgen Lauterwein

Publisher
John Wiley and Sons
Year
1983
Tongue
German
Weight
663 KB
Volume
66
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

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.

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