Metal Complexes with Redox-Active Ligands in the Indirect Electrosynthesis of Organic Sulfur Compounds

A possibility of using metal complexes with redox-active ligands in organic electrosynthesis is demonstrated on the basis of literature data analysis. Unlike homogeneous catalysis, many examples are known for the application of complexes of this type in electrocatalytic processes characterized by a higher selectivity and milder conditions. Interest in metal complexes with redox-active ligands is due to their use in the heterogeneous electrocatalysis as well. The main attention is given to advantages of the indirect electrosynthesis of organic compounds, in particular, sulfur derivatives, in the presence of mediators or electrocatalysts based on metal complexes with redox-active ligands. Active forms of metal complexes are generated at the electrodes and can initiate the further transformations of inert substrates. A significant decrease in power expenses compared to the direct redox activation of reagents is the main advantage of indirect electrosynthesis. The cyclic processes favoring a permanent regeneration of metal complexes lead to an increase in the yield of target compounds.