Spectrophotometric evidence for the formation of a short-lived Mn(VI) intermediate has been confirmed during the oxidation of alginae polysaccharide by potassium permanganate in alkaline medium at pH> 12. This Mn(VI) intermediate was characterized by a band at a wavelength of 606 nm, an absorption maximum, with a molar extinction coefficient of 1200 + 50 dm3/mol/cm.
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