Abstract
Measurements on the rate of oxidation of 2-hydroxy-2-methylpropanoic acid (hmpa) by VVaq in aqueous perchloric acid at high initial ratios [hmpa] : [VVaq] show that the order in [VVaq] is unity but that in [hmpa] lies between zero and unity. The variation of rate with acidity shows that two pathways operate, each involving a 1:1 complex of VV and hmpa; one complex differs from the other by the addition of two protons. Overall values of the enthalpies and entropies of activation are determined; these are compared with values obtained for the oxidation of other substrates by VVaq and those for the oxidation of hmpa by other aqua-cations.
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