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1H NMR study of naphthoflavones with shift reagents

✍ Scribed by P. Joseph-Nathan; R. L. Santillan

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 154 KB
Volume: 22
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1270220217

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✦ Synopsis

The complete assignment of the proton NMR spectra of several a-, pand ynaphthoflavones at 100 MHz using Eu(fod), and double resonance experiments has been carried out. The compounds were found to associate at the carbonyi oxygen, by analogy with flavones where complete structural assignment can be attained using Pr(fod), at 60MHz. The three types of naphthoflavones can be distinguished by observation of the quantitative lanthanide-induced shifts at H-3 and/or H-5, combined with their chemical shift values in the absence of shift reagent.

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