Abstract
The reaction kinetics of catechol or resorcinol with cerium (Ce) ammonium sulfate were spectrophotometrically investigated in polymer media containing polyethylene glycol (PEG 200, 600, 1500, and 4000). Kinetic runs for Ce(IV) were performed under pseudo-first-order reaction conditions. The reaction was found to be first-order for Ce(IV) and fractional orders for catechol, resorcinol, and H+. The presence of PEG caused considerable acceleration of the oxidation of the two substrates. Of note, PEG 4000 presents a distinguished catalytic activity when compared with PEG 200, 600, and 1500 in an acidic medium. The kinetic results were modeled using the Benesi–Hildebrand and Menger–Portnoy equations to explain the nature of the catalytic effects of both PEG forms and substrates. Hence, the efficiency of the reaction was optimal in the presence of resorcinol as a substrate. Based on kinetic features and thermodynamic parameters, probable mechanisms and expected final products are suggested and discussed.
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The authors wish to convey their sincere thanks to Philadelphia University in Jordan for successfully conducting the all kinetic runs in the scientific laboratory.
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Dahadha, A.A., Saadh, M.J., Mfarej, T. et al. Polyethylene Glycols Catalyzed Reaction of Catechol and Resorcinol with Cerium Ammonium Sulfate in the Aqueous Medium: Kinetic and Mechanistic Study. Chemistry Africa 5, 1417–1426 (2022). https://doi.org/10.1007/s42250-022-00436-y
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DOI: https://doi.org/10.1007/s42250-022-00436-y