The Open Catalysis Journal

2009, 2 : 12-20
Published online 2009 March 11. DOI: 10.2174/1876214X00902010012
Publisher ID: TOCATJ-2-12

Oxidation of Valine by N-Bromophthalimide in Presence of Chloro- Complex of Pd(II) as Homogenous Catalyst: A Kinetic and Mechanistic Study

Singh Ajaya Kumar , Jain Bhawana , Negi Reena , Katre Yokraj and Singh S.P.
Department of Chemistry, Govt. V.Y.T. PG. Autonomous College Durg (C.G.), India.

ABSTRACT

Kinetics of Pd(II) catalyzed oxidation of valine has been studied by N-bromophthalimide (NBP) in acidic medium at 303 K. The reaction follows first order kinetics with respect to [Pd(II)] while negative effect was observed for the variation of [H+] on the rate of reaction. The reaction exhibits first order kinetics with respect to [NBP] at its lower concentrations and tends towards zero order at its higher concentrations. Rate of reaction exhibits zero order and fractional order kinetics with respect to [valine] and [Cl-] respectively. [Hg(OAc)2], [phthalimide], ionic strength (I) and dielectric constant of the medium did not bring about any significant change on the rate of reaction. The rate constants observed at five different temperatures (298 K-318 K) were utilized to calculate the activation parameters. A plausible mechanism has been proposed from the results of kinetic studies, reaction stoichiometry and product analysis.

Keywords:

Kinetics, oxidation, mechanism.