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Antioxidant activities of Crataegus monogyna extracts

T Bahorun1, F Trotin, J Pommery

  • 1Laboratoire de Physiologie Cellulaire et Morphogenèse Végétale, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France.

Planta Medica
|August 1, 1994
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...