13. Mechanistic Study of  Ruthenium(III) Catalyzed Oxidation of Xylose by Acidified Potassium Bromate

 Sheila Srivastava*, Ashish Kumar, Parul Srivastava and Shalini Singh

Chemical Laboratories, Feroze Gandhi College, Rae Bareli – 229 001, U.P. India.

e-mail: she_ila72@yahoo.com

ABSTRACT

Kinetic investigation on ruthenium(III) catalyzed oxidation of xylose by an acidified solution of potassium bromate in the presence of mercuric acetate as a scavenger for Br- ion have been carried out in the temperature range 300 – 450C.  First order kinetics in the lower KBrO3 concentration range tended to zero order at higher concentration. The order of reaction with respect to  substrate is zero but the order with respect to Ru(III)  is one. Increase in [Cl-] shows negligible effect while increase in [H+] shows negative effect. Negligible effect of mercuric acetate and ionic strength of the medium was observed. D2O have an insignificant effect on the reaction rate. A suitable mechanism in conformity with the kinetic observations has been proposed, and the various activation parameters have been calculated.

* Author for correspondence

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