•H2O adduct, which likely inhibits the formation of C2O4 2-•CO2. The extent to which C2O4 (the reduced product) and 6 x 10 -4 mmol 4-BrBN (starting material), corresponding to a 95% conversion yield. Figure provides a summary of the optimized reaction conditions, while Figures and present examples of electron deficient aryl bromides and chlorides, respectively, that underwent hydrodehalogenation using the oxidative reduction method. Each substrate shown in Figure was selected based on E 0 of the substrate and its product relative to that of CO2 •-.