Diborenium and Diborynium Cations: Combining Hypovalency, Multiple Bonding, Positive Charge and Unpaired Electrons

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Compounds with boron-boron multiple bonding are generally highly electron-rich species and strong reductants. However, we have discovered a number of intriguing cationic compounds that contain varying degrees of B–B multiple bonding, namely diborenium (mono/di)cations and radical cations. These compounds combine a range of seemingly incompatible properties such as hypovalency, multiple bonding, positive charge and unpaired electrons. Thus, they are fascinating subjects for fundamental investigation, while their simultaneous electron-rich and -poor character potentially makes them powerful main-group ambiphiles with the ability to activate inert small molecules. This project aims to explore the synthetic scope of these cations as well as their rich further reactivity.