Electrochemical fixation of CO2 to organohalides in room-temperature ionic liquids under supercritical CO2

• The electrochemical properties of novel reaction media such as ionic liquid (IL)/supercriticalCO2(scCO2) systems were evaluated.
• The IL/scCO2 systems were applied as reaction media for the electrochemical carboxylationof various organohalides.
• The IL/scCO2 systems were determined as useful media for the electrochemicalcarboxylation.
• The current efficiencies obtained for the IL/scCO2 systems were much higher than thoseobtained in ILs under subcritical CO2 conditions.

The electrochemical properties of novel reaction media, ionic liquid (IL)/supercritical CO2 (scCO2) systems, were evaluated and the electrochemical carboxylation of various organohalides in these systems was demonstrated. Voltammetric studies revealed that the CO2 solubility in an IL such as N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium bis(trifluoromethanesulfonyl) imide ([DEME][TFSI]) increased in the presence of scCO2. The IL/scCO2 systems were found to be effective for the electrochemical carboxylation of various organohalides.

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