Bromide ion oxidation of various Pt surfaces

Selective Electrochemical Dibromination of Terpenes and Naturally Derived Olefins

“…Cyclic voltammetry studies revealed that the generation of bromine is a 2‐electron‐oxidation process in which bromide anions undergo oxidation to form bromine that are in equilibria with the relatively stable tribromide species. The second oxidation is accounted to the oxidation of these tribromide species to bromine, which was in accordance with previous reports [57–60] . The electrochemical bromination is assumed to occur via the formation of the reactive bromonium ion intermediates which then undergo nucleophilic ring opening by the free bromide anions resulting in the desired products.…”

“…The second oxidation is accounted to the oxidation of these tribromide species to bromine, which was in accordance with previous reports. [57][58][59][60] The electrochemical bromination is assumed to occur via the formation of the reactive bromonium ion intermediates which then undergo nucleophilic ring opening by the free bromide anions resulting in the desired products. The reaction is complemented by the cathodic reduction of water to generate hydrogen gas.…”

Electrochemical Bromofunctionalization of Alkenes and Alkynes—To Sustainability and Beyond

“…Oxidative electrochemistry provides a fundamentally greener alternative compared to the traditional strategies, as electricity replaces the usually harmful and surplus redox reagents. The relatively low oxidation potential of bromides has inspired extensive studies for the electro-generation of bromine in different solvent systems [47][48][49]. The oxidation of bromide to bromine or to its stable tribromide salt is described as a two-electron transfer process (Equation (1)), which has been extensively studied in aprotic media due to the stabilization effect of solvent, facilitating the formation of both brominating species simultaneously [47][48][49].…”

“…The relatively low oxidation potential of bromides has inspired extensive studies for the electro-generation of bromine in different solvent systems [47][48][49]. The oxidation of bromide to bromine or to its stable tribromide salt is described as a two-electron transfer process (Equation (1)), which has been extensively studied in aprotic media due to the stabilization effect of solvent, facilitating the formation of both brominating species simultaneously [47][48][49]. The first oxidation potential corresponds to the direct formation of bromine (0.82 V in acetonitrile at a platinum disk electrode), which simultaneously forms stable tribromide complexes in the presence of a high bromide concentration in aprotic media (Equation ( 2)) [47].…”

Simulation and Fitting of Cyclic Voltammetry and Chronoamperometry Curves of Electrochemical Reactions with Different Mechanisms — A Didactic Perspective

“…Halasz et al [22] investigated the influence of different orientations of a platinum, single crystal and of a polycrystalline surface on the electrooxidation of bromide with linear sweep voltammetry and CV. The authors compared sulfuric acid and nitromethane as solvents.…”