1H NMR study of naphthoflavones with shift reagents
作者:P. Joseph-Nathan、R. L. Santillan
DOI:10.1002/mrc.1270220217
日期:1984.2
AbstractThe complete assignment of the proton NMR spectra of several α‐, β‐ and γ‐ naphthoflavones at 100 MHz using Eu(fod), and double resonance experi‐ ments 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)3, at 60MHz. The three types of naphthoflavones can be distinguished by observation of the quantitative lanth‐ anide‐induced shifts at H‐3 and/or H‐5, combined with their chemical shift values in the absence of shift reagent.
Pillon, Bulletin de la Societe Chimique de France, 1955, p. 39,40