A Novel Oxidation of Valine by N-Bromophthalimide in the Presence of Ruthenium(III) Chloride as a Homogeneous Catalyst
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Kinetics of Ruthenium(III) [Ru(III)] chloride catalyzed oxidation of valine (Val) has been studied by N-bromophthalimide (NBP) in the acidic medium at 35C. The reaction rate follows first-order and zero-order dependence with respect to [NBP] and [Val]. First-order kinetics was observed for Ru(III) chloride at low range of concentrations and tending towards zero-order at higher concentrations. A negative effect was observed for [H+] and [phthalimide], while a positive effect was observed for [Cl-] on the reaction rate. Hg(OAc)2, ionic strength (I), and dielectric constant (D) of the medium did not change significantly the reaction rate. The rate constants as a function of temperature (298-318 K) were used to calculate activation parameters of the oxidation of Val by NBP. A plausible mechanism was proposed to explain the results of kinetic studies, reaction stoichiometry and product analysis. Springer Science+Business Media, LLC 2009.
author list (cited authors)
Singh, A. K., Jain, B., Negi, R., Katre, Y., Singh, S. P., & Sharma, V. K.
complete list of authors
Singh, Ajaya Kumar||Jain, Bhawana||Negi, Reena||Katre, Yokraj||Singh, Surya Prakash||Sharma, Virender K