KINETICS OF OXIDATION OF MONOSACCHARIDES WITH CERIUM(IV)

Article abstract of DOI:10.1016/0008-6215(87)80265-3

The kinetics of the oxidation of D-galactose, D-glucose, D-mannose, D-fructose, L-sorbose, L-arabinose, D-ribose, and D-xylose with cerium(IV) in perchloric acid were studied.Two complexes were found to form in each case.The first complex forms in a pre-equilibrium reaction during mixing in the stopped-flow apparatus.Michaelis-Menten kinetics were observed for this oxidation.The values of the complex-formation and dissociation rate-constants were determined in 1.0 M HClO4.The dissociation partly involves the oxidation of the first complex and partly, the formation of a second, more-stable complex.This second complex is oxidized much more slowly than the first, and the values of the pseudo-first-order rate-constant were again determined in 1.0 M HClO4.The values proved to be almost constant in the range of 0.1 M to 1.0 M , from which it was concluded that practically all of the Ce(IV) was complexed.