Homogeneous catalytic oxidation of some polyhydric alcohols by iridium trichloride

Sheila Srivastava, Parul Srivastava, Vandana Gupta and Arti Jaiswal

Abstract

The kinetic investigation for catalyzed oxidation of D-sorbitol and glycerol using in Ir(III) in an acidified solution of NBS in the presence of Hg(OAc)2 as a scavenger for bromide ion has been carried out in the temperature range of 300 - 450 C. First order kinetics in the lower NBS concentration range tended to zero order at higher concentration. Increase in concentration of Cl- and H+ ion showed fractional inverse order while the order of reaction w.r.t. substrate was zero. Negligible effect of Hg(OAc)2 and ionic strength of the medium was observed. A suitable mechanism in conformity with the kinetic observations has been proposed and the various activation parameters have been calculated.