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A persistent and predominantly localized boron radical has been synthesized by the single‐electron reduction of a 3D analogue of an NHC‐stabilized 9‐borafluorenium cation. The steric and electron‐withdrawing effect of the 1,1’‐bis(o‐carborane) backbone and the almost perpendicular orientation of the NHC ligand give rise to the distinct boron‐centered radical character, as evidenced by single crystal...
In this contribution, we reported the three‐dimensional (3D) analogues of N‐heterocyclic carbene (NHC)‐stabilized 9‐borafluorenium and 9‐borafluorene radical. The radical was fully characterized by cyclic voltammetry (CV), UV‐Vis absorption spectroscopy, electron paramagnetic resonance (EPR) and single‐crystal X‐ray diffraction analyses. The distinct boron‐centered radical character of 9‐borafluorene...