Spectroscopic studies on the reaction of superoxide ion with tocopherol model compound, 6-hydroxy-2,2,5,7,8-pentamethylchroman.
The reaction of superoxide ion, O2-, with alpha-tocopherol model compound, 6-hydroxy-2,2,5,7,8-pentamethylchroman (1b), was investigated spectrophotometrically in acetonitirle. The transient absorption (lambda max = 330 nm) observed at the initial stage of the reaction was ascribed to the chromanoxyl-type radical, one-elecron oxidation product of compound 1b, on the basis of the spectroscopic [ultraviolet (UV)/visible and electron spin resonance (ESR)] data. Further, the final product observed was ascribable to the tocopherol quinone (3).
Ozawa
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Hanaki
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D001578:Benzopyrans; D055598:Chemical Phenomena; D002621:Chemistry; D002839:Chromans; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013481:Superoxides; D014810:Vitamin E
D001578:Benzopyrans; D002839:Chromans; D005609:Free Radicals; D013481:Superoxides; D014810:Vitamin E; C029141:2,2,5,7,8-pentamethyl-1-hydroxychroman