Analysis of the tautomeric structures of auronols by13C n.m.r. and comparison with the isomeric flavonols
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- p. 3182-3185
- https://doi.org/10.1039/p19810003182
Abstract
The 13C n.m.r. spectra of a series of auronols and flavonols have been analysed in order to determine the tautomeric structures of the auronols and to distinguish between the two series. By using a specifically 13C labelled auronol sample, together with coupling constants, changes on additin of D2O, and solvent-shift data, it has been shownthat auronol and 6-substituted auronols exist in solution as the 2-benzoyl-3-hydroxybenzofurans whereas 4,6 dihydroxyauronol exists as a mixture of the E- and Z-7′-hydroxyaurones.Keywords
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