Study Of The Oxidation Of 35 Di Tert Butylcatechol
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Study of the oxidation of 3,5-di-tert-butylcatechol with molecular oxygen catalyzed by of 5, 10, 15, 20-tetraphenylporphyrinatocobalt(II).
M. Hassanein, S. El-Khalafy*, S. Shendy
Tanta University, Faculty of Science, Department of Chemistry, Tanta 31527, Egypt.
5, 10, 15, 20-tetraphenylporphyrinatocobalt(II) showed good catalytic activity towards oxidation of 3,5-di-tert-butylcatechol to 3,5-di-tert-butyl-benzoquinone by dioxygen in dimethylformamide. The oxidation reaction was followed by measuring dioxygen uptake. The rate constant of oxidation reaction showed a linear dependence on catalyst concentration and saturation kinetics in both 3,5-di-tert-butylcatechol concentration and dioxygen pressure. The kinetic parameters have been determined using Michaelis-Menten approach. A mechanism has been suggested for the oxidation reaction.
Keywords: Cobalt(II)porphyrin complex; oxidation; 3,5-di-tert-butyl- catechol; dioxygen oxygen; 3,5-di-tert-butylbenzoquinone.
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1. Introduction Oxidation processes requiring the activation of molecular oxygen are challenging. Nature has evolved an elegant solution to overcome the kinetic barrier for the activation of dioxygen by using transition metals incorporated into proteins. That is how several metalloenzymes can catalyze the controlled and selective oxidation of organic compounds