Abstract
Abstract Electrochemical oxidation of catechol and some of 3-substituted catechols (1a–c ) has been studied in the presence of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one ( 3 ) as the nucleophile at various pH values in aqueous solution using cyclic voltammetric and controlled-potential coulometric methods. The results revealed that the products derived from catechols ( 1a–c ) participate in Michael addition reactions with 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one ( 3 ) via an ECEC mechanism, converts it to form the corresponding pyrazole derivatives ( 8a–c ). The electrosynthesis of these products was carried out at the surface of carbon electrode in an undivided cell under controlled-potential conditions which is an environmentally friendly method.
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