Kinetics and mechanism of oxidation of some reducing sugars by diperiodatoargentate(III) in alkaline medium |
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Authors: | K Venkata Krishna P Jaya Prakash Rao |
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Institution: | (1) Department of Chemistry, Osmania University, 500 007 Hyderabad, India |
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Abstract: | Summary The kinetics of oxidation of d-glucose, d-galactose, d-fructose, d-ribose, d-arabinose, d-xylose and 2-deoxyd-glucose by diperiodatoargentate(III) (DPA) have been investigated in alkaline medium. The order of the reaction with respect to DPA] is unity while the order with respect to sugar] is < 1 over the concentration range studied. The rate increases with an increase in OH –] and there is a marginal decrease in the rate with an increase in IO
inf4
sup–
]. No significant dependence on ionic strength was found, but the rate increases with a decreasing dielectric constant. Formic acid and the corresponding aldonic acids were detected as the products of oxidation. The participation of the open chain form of the sugar and a mechanism involving the initial formation of a complex between the enediol of the sugar and AgIII are proposed. |
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