Kinetics and mechanism of oxidation of ascorbic acid by manganese(III) in aqueous acidic perchlorate media

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Abstract
The kinetics and mechanism of oxidation of ascorbic acid (H2A) by MnIII in aqueous acidic perchlorate media have been investigated by means of stopped-flow spectrophotometry. The rate law is of the form –½d[MnIII]/dt=(ka+kb[H+]–1)[MnIII][H2A] where the two terms have been assigned to reactions involving the undissociated form of ascorbic acid with Mn3+(aq) and [Mn(OH)]2+(aq) respectively. Comparison with similar reactions involving benzenediols suggests some conclusions on the reduction potentials and the oxidation mechanism of ascorbic acid.
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