Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.
El-Khalafy, S., Hassanein, M., Shendy, S. (2023). Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.. EKB Journal Management System, 66(10), 9-15. doi: 10.21608/ejchem.2023.192130.7603
Sahar H El-Khalafy; Mahmoud T Hassanein; Samah A Shendy. "Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.". EKB Journal Management System, 66, 10, 2023, 9-15. doi: 10.21608/ejchem.2023.192130.7603
El-Khalafy, S., Hassanein, M., Shendy, S. (2023). 'Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.', EKB Journal Management System, 66(10), pp. 9-15. doi: 10.21608/ejchem.2023.192130.7603
El-Khalafy, S., Hassanein, M., Shendy, S. Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.. EKB Journal Management System, 2023; 66(10): 9-15. doi: 10.21608/ejchem.2023.192130.7603

Efficient Catalyst 5, 10, 15, 20-Tetraphenylporphyrinatocobalt(II) Complex for the Oxidation of 3,5-Di-tert-butylcatechol to the Corresponding Quinone with Molecular Oxygen.

Egyptian Journal of Chemistry
Volume 66, Issue 10, October 2023, Page 9-15  XML PDF (219.58 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2023.192130.7603
View on SCiNiTO View on SCiNiTO
Authors
Sahar H El-Khalafy email ; Mahmoud T Hassanein; Samah A Shendy
Tanta University, Faculty of Science, Department of Chemistry, Tanta 31527, Egypt
Abstract
5, 10, 15, 20-tetraphenylporphyrinatocobalt(II) complex has been found to be an efficient catalyst for the oxidationn of 3,5-di-tert-butylcatechol to 3,5-di-tert-butylbenzoquinone by molecular oxygen) in dimethylformamide. Measurement of dioxygen uptake was used to monitor the oxidation process. The oxidation reaction rate constant was reported to be linearly related to the concentration of catalyst, and saturation kinetics were shown to be dependent on both 3,5-di-tert-butylcatechol concentration and dioxygen pressure. The Michaelis-Menten method was used to obtain the kinetic parameters. A mechanism also has been proposed according to kinetic data, production of a ternary complex involving catalyst, substrate, and dioxygen and the formation of the semiquinone anion radical (3,5-DBSQ.) which detected by ESR spectroscopy. The system investigated is a functional model of catecholase like activity, based on free-radical intermediates, a possibility recently demonstrated for certain oxidoreductases.
Keywords
catalysis; 3,5-di-tert-butyl-catechol; Cobalt(II)porphyrin complex; 3,5-di-tert-butylbenzoquinone
Statistics
Article View: 182
PDF Download: 160