Flavonoid compounds are one of the largest groups of naturally occurring heterocyclic compounds. These include flavones, isoflavones, coumarins, chalcones, rotenoids, pterocarpans and aurones. Except for the naturally occurring aurones a considerable amount of 13C-nmr data has been reported for the flavonoids (1-10). Pelter, et aL, have studied cmethoxy, 6-methoxy-4'- hydroxy and some methyl derivatives of aurones. They assigned chemical ...