Flavonoids, isoflavonoids and neoflavonoids are natural products derived from 2-phenylchromen-4-one (flavone), 3-phenylchromen-4-one, and 4-phenylcoumarin, respectively. Derivations include reduction of the 2(3) carbon-carbon double bond (flavanones), reduction of the keto group (flavanols), and hydroxylation at various positions. See also anthocyanins, chalcones.
2-phenylchromen-4-one 3-phenylchromen-4-one 4-phenylcoumarin
J.B. Harborne, T. H. Mabry and H. Mabry, The Flavonoids, Chapman & Hall, 1975.
