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Revised version of the original three‐step reaction cycle for reduction of CO2 to oxalic acid. The starting CuII complex (1 or 2) is reduced to a CuI complex by sodium ascorbate (3). In the presence of oxygen, the ascorbate is reduced to oxalate to give oxalate‐bridged complex (4). In the presence of CO2 and absence of ascorbate, however, a stable three‐valent carbonate complex is formed. Reproduced with permission form Ref. [155]. Copyright 2021, Nature Publishing Group.
