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Kinetics and mechanism of oxidation of d-glucopyranose 6-phosphate and d-ribofuranose 5-phosphate by vanadium(V) in perchloric acid media
Institution:1. Laboratory of Biological Psychology, KU Leuven, Tiensestraat 102, 3000 Leuven, Belgium;2. Institute of Biochemistry, University of Kiel, Olshausenstrasse 40, 24098 Kiel, Germany;3. Zymenex A/S, Roskildevej 12C, 3400 Hillerød, Denmark;1. Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA;2. Microbe–Host Interactions Training Program, Vanderbilt University School of Medicine, Nashville, TN, USA;3. Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, TN, USA;1. ARC Centre of Excellence in Cognition and Its Disorders, Australia;2. Perception in Action Research Centre (PARC), Australia;3. Department of Cognitive Science, Australia
Abstract:The second-order rate constants for the oxidations of d-glucopyranose 6-phosphate and d-ribofuranose 5-phosphate by vanadium(V) in perchloric acid media have been measured spectrophotometrically in the visible region. The order with respect to H+] is less than unity for each reaction. The enthalpy and entropy of activations of the reactions are higher than those for the corresponding two-electron oxidations by chromium(VI). The oxidation involves free-radical intermediates.
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