Quick on the uptake: Uranium(III) complexes bearing hexadentate triazacyclononane macrocyclic ligands L1 engage di- and triketones in both one- and two-electron reduction pathways. The dinuclear enolate generated through one of these pathways reacts with carbon dioxide to generate a new CC bond (see scheme).
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Zuend et al. (2011) studied this question.
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