Concentrated Aqueous Peroxodicarbonate: Efficient Electrosyn‐ thesis and Use as Oxidizer in Epoxidations, S‐, and N‐Oxidations

Peroxodicarbonates are of substantial interest as potentially powerful and sustainable oxidizers but have so far been accessible only in low concentrations with unsatisfactory energy efficiency. Concentrated (> 0.9 mol L^-1 ) peroxodicarbonate solutions have now been made accessible by the electrolysis of aqueous K₂ CO₃ /Na₂ CO₃ /KHCO₃ solutions at high current density of 3.33 A cm^-2 in an efficiently cooled circular flow reactor equipped with a boron-doped diamond anode and a stainless-steel cathode. Their synthetic potential as platform oxidizers was clearly demonstrated in transformations including sulfoxidation, N-oxidation, and epoxidation.