7424-07-9Relevant articles and documents
KINETICS AND MECHANISM OF OXIDATION OF D-GLUCOPYRANOSE 6-PHOSPHATE AND D-RIBOFURANOSE 5-PHOSPHATE BY VANADIUM(V) IN PERCHLORIC ACID MEDIA
Gupta, Kalyan Kali Sen,Gupta, Shipra Sen,Mandal, Subrata Kumar,Basu, Samarendra Nath
, p. 193 - 200 (1986)
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 +> 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 oxidations involve free-radical intermediates.
Reactivity of some sugars and sugar phosphates towards gold(III) in sodium acetate-acetic acid buffer medium
Sen Gupta, Kalyan Kali,Pal, Biswajit,Begum, Bilkis Ara
, p. 115 - 123 (2007/10/03)
The kinetics of the oxidation of some aldoses and aldose phosphates have been studied spectrophotometrically in sodium acetate-acetic acid buffer medium at different temperatures. The reactions are first order with respect to [Au(III)] and [substrate]. Both H+ and Cl- ions retard the reaction. The reactions appear to involve different gold(III) species, viz. AuCl4/-, AuCl3(OH2) and AuCl3(OH)-. The results are interpreted in terms of the probable intermediate formation of free radicals and Au(II). Aldoses react with gold(III) in the order: triose > tetrose > pentose > hexose. The sugar phosphates react with gold(III) at a faster rate than the parent sugars except glucose-1-phosphate, which reacts at slower rates than glucose. A tentative reaction mechanism leading to the formation of products has been suggested.
