Table 1 Optimization of the reaction conditions^[a]

[a] Reaction conditions: undivided cell, Mg plate anode (10 mm × 20 mm × 0.5 mm), C plate cathode (10 mm × 20 mm × 1.0 mm), 1a (0.2 mmol), electrolyte (0.2 mmol), CO₂ (1 atm), solvent (3.0 mL), 8 mA, 3.5 h, room temperature (R.T.). [b] 6 mA. [c] 1a (0.1 mmol). [d] The yield was determined by ¹H NMR using maleic acid as the internal standard. [e] Isolated yield. DMF=N, N-dimethylformamide, DMSO dimethyl sulfoxide, CH₃CN acetonitrile, NMP N-methyl-2-pyrrolidone, DMAC=N, N-dimethylacetamide, TBAC tetrabutylammonium chloride, TBAI tetrabutylammonium iodide, TBAB tetrabutylammonium bromide, TB0AClO₄ tetrabutylammonium perchlorate, TBABF₄ tetrabutylammonium tetrafluoroborate, TBAPF₆ tetrabutylammonium hexafluorophosphate.

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