Reductive Elimination From Tetra‐Alkyl Cuprates [MenCu(CF3)4−n]− (n=0–4): Beyond Simple Oxidation States

In recent years, the electronic structures of organocuprates in general and the complex [Cu(CF3)4]− in particular have attracted significant interest. A possible key indicator in this context is the reactivity of these species. Nonetheless, this aspect has received only limited attention. Here, we systematically study the series of tetra‐alkyl cuprates [MenCu(CF3)4−n]− and their unimolecular reactivity in the gas phase, which includes concerted formal reductive eliminations as well as radical losses. Through computational studies, we characterize the electronic structures of the complexes and show how these are connected to their reactivity. We find that all [MenCu(CF3)4−n]− ions feature inverted ligand fields and that the distinct reactivity patterns of the individual complexes arise from the interplay of different effects. The full series of high‐valent cuprates [MenCu(CF3)4−n]−, 0≤n≤4, has been studied by a combination of gas‐phase fragmentation experiments and quantum chemical calculations. The distinct reactivities observed can be attributed to subtle differences in the electronic structures of the complexes.