Suppressing carboxylate nucleophilicity with inorganic salts enables selective electrocarboxylation without sacrificial anodes.

Moreover, the 1 H NMR chemical shifts of protons along the alkyl chain of the carboxylate showed a trend of shifting downfield as more MgBr 2 was present in solution ( Fig. 1E ), a trend also seen in the literature. 64,65 The shift downfield at higher MgBr 2 concentrations likely stems from greater electron withdrawal by Mg 2+ coordinating to the carboxylate group, causing the protons to become deshielded. 13 C NMR chemical shifts also change as a function of MgBr 2 concentration, moving either upfield or downfield depending on the carbon atom identity (Fig.

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