| Summary: | Kinetics and mechanism of purine-based alkaloids like caffeine, theobromine, and theophylline, have been studied using Mn (III) sulfate as an efficient reagent in an aqueous sulfuric acid medium. Progress of the reaction is for the oxidation of xanthine alkaloids has been studied at 520 nm wavelength (λ). Reactions indicated first-order kinetics in [Mn (III)], and [xanthine alkaloid]. Reaction rates accelerated with an increase in acid concentration and temperature. Eyring’s and Gibbs-Helmholtz equations were used for the calculation of activation parameters. Observed rate enhancements herein, are analyzed by Zucker-Hammett, Bunnett, and Bunnett-Olsen criteria of acidity functions. The results found as per Bunnett-Olsen criteria of acidity functions, the most plausible mechanism has been proposed by considering the participation of H2O molecule, as a proton transferring agent in RD (Rate Determining) step. © 2021, Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma. All rights reserved.
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