Abstract
The proton resonance spectra have been used along with the interactions with the lanthanoid shift reagent tris-1,1,1,2,2,3,3-heptofluoro-7,7-dimethyloctane-2,6-dione-Eu(III) to establish the isomeric forms and preferred conformations of substituted aurones and thioaurones. Calculations have been performed on the geometrical structures of the LSR-substrate adducts for certain compounds.
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