Carbon dioxide as carbon source: Activation via electrogenerated O2 in ionic liquids |
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Authors: | Marta Feroci Isabella Chiarotto Monica Orsini Giovanni Sotgiu Achille Inesi |
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Affiliation: | aDipartimento di Scienze di Base e Applicate per l’Ingegneria, “Sapienza” Università di Roma, via del Castro Laurenziano, 7, I-00161 Roma, Italy;bDipartimento di Elettronica Applicata, Università di Roma Tre, via Vasca Navale, 84, I-00146 Roma, Italy |
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Abstract: | The activation of carbon dioxide has been obtained in O2/CO2 saturated ionic liquids, via electrochemically generated O2−, at a less negative potential than the one of the direct cathodic reduction of CO2. This electrochemical activation has been applied to the C–N bond formation from amines and carbon dioxide in the synthesis of organic carbamates. A competitive reaction between electrogenerated superoxide ion and imidazolium cations yielding 2-imidazolones has been pointed out. This procedure allows to avoid the utilization of volatile and toxic organic solvents, supporting electrolytes and catalysts. |
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Keywords: | Electrogenerated superoxide ion Carbon dioxide Ionic liquids Carbamates 2-Imidazolones |
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