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Reactions of quinone with internal amines. Dopamine quinone formed by the two-electron oxidation of dopamine reacts rapidly with the internal amino group forming leucochrome, which is converted readily to dopaminechrome similar to the dopachrome conversion reaction shown in Figure 1. Interestingly dopaminechrome is also generated during the oxidation of 6-hydroxydopamine as a condensation of product of 6-hydroxydopaminequinone.
