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Electrochemical oxidation of dopamine (DA) in the presence of p-phenylenediamine (PPD) as a nucleophile in aqueous buffered solutions was studied. The results indicate that the o-dopaminoquinone (o-DQ) electrochemically derived from DA participates in 1,4-Michael addition with PPD to form the corresponding new derivative (P2), which is present as the oxidized state (Q2) at the electrolysis applied...