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The present work explains the electrochemical behavior of catechols in the presence of thiourea as a nucleophile in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. The results indicate that the participation of catechols in the Michael reaction with thiourea form the corresponding o-dihydroxybenz-thiourea adduct. Based on an EC mechanism, the observed homogeneous rate constants were estimated by comparing the experimental cyclic voltammetric responses with the digital simulated results. The calculated observed homogeneous rate constants (kobs) was found to vary in order 2,3-Dihydroxybenzoicacid, Catechol, 3,4-Dihydroxybenzoicacid, 3-Methylcatechol, 3-Methoxycatechol, 4-Methylcatechol, 4-Tert-butylcatechol.
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Dowlati et al. (2011) studied this question.
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