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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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Polyoxygenated flavones from the leaves of comptonella microcarpa

Girard1, Muyard, Bevalot

  • 1Laboratoire de Pharmacognosie, Faculte de Medecine et de Pharmacie, Place St. Jacques, F25030 Besancon Cedex, France, Departement de Pharmacognosie, U.R.A. au C.N.R.S. 1310, Universite Rene Descartes, 4 avenue de l'Observatoire, F75006 Paris Cede.

Journal of Natural Products
|September 10, 1999
PubMed

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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...