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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Flavonoids from the flowers of Aesculus hippocastanum

Marlena Dudek-Makuch1, Irena Matławska

  • 1Department of Pharmacognosy, University of Medical Sciences in Poznań, 4 Swiecickiego St., 60-781 Poznań, Poland. dudum@poczta.onet.pl

Acta Poloniae Pharmaceutica
|June 9, 2011
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...