Proton-Coupled Electron Transfer in the Reaction of 3,4-Dihydroxyphenylpyruvic Acid with Reactive Species in Various Media

Figure 2

Thermodynamic cycle showing ET-PT, PT-ET, and CPCET mechanisms involving coreactive species X. The indices 1 and 2 are devoted to ET-PT and PT-ET mechanisms, respectively. ROH is a phenolic acid.