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- W2006314394 abstract "The kinetics and mechanism of the oxidation of 2-deoxy-D-glucose (dGlc) by CrVI which yields 2-deoxy-D-gluconic acid and CrIII as final products when a ten-fold or higher excess of sugar over CrVI is used, have been studied. The redox reactions occur through CrVI→ CrIV→ CrIII and CrVI→ CrV→ CrIII paths. The experimental data were fitted with a multilinear regression program. The complete rate law for the chromium(VI) oxidation reaction is expressed by –d[CrVI]/dt={c[H+]+(d+e[H+]+f[H+]2)[dGlc]}[CrVI], where c=(5 ± 1)× 10–4 dm3 mol–1 s–1, d=(3 ± 2)× 10–4 dm3 mol–1 s–1, e=(115 ± 13)× 10–4 dm6 mol–2 s–1 and f=(402 ± 17)× 10–4 dm9 mol–3 s–1, at 50 °C. Chromium(V) is formed in a rapid step by reaction of the radical dGlc and CrVI and CV reacts with dGlc faster than does CrVI. The chromium(V) oxidation of dGlc follows the rate low –dCrV/dt=(k1+k2[H+])[dGlc][CrV], where k1= 2.52 × 10–4 dm3 mol–1 s–1 and k2= 54.0 dm6 mol–2 s–1, at 25 °C. The EPR spectra show that three 1:1 CrV:dGlc intermediate complexes (g1= 1.9781, g2= 1.9752, g3= 1.9758) are formed in rapid pre-equilibria before the redox steps." @default.
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- W2006314394 date "1996-01-01" @default.
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- W2006314394 title "Comparative study of oxidation by chromium(V) and chromium(VI)" @default.
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- W2006314394 doi "https://doi.org/10.1039/dt9960001607" @default.
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