DETERMINATION OF C-6 OR C-8 SUBSTITUTED FLAVANONE USING ¹³C-¹H LONG RANGE COUPLING AND THE REVISED STRUCTURES OF SOME FLAVANONES

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C-6 or C-8 substituted flavanones were determined by methods of chemical and/or ¹H-NMR spectral analysis. We report a very convenient method for determining the substituted position of these flavanones using ¹³C-¹H long range coupling. In connection with this study, we revised some structures of flavanones using this technique.