Cover Feature: Persistent and Predominantly Localized Boron Radical from the Reduction of a Three‐Dimensional Analogue of NHC‐Stabilized Borafluorenium (Chem. Eur. J. 42/2023)

Abstract

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 X-ray diffraction analysis, EPR spectroscopy, and DFT calculations. More information can be found in the Research Article by Q. Ye and co-workers (DOI: 10.1002/chem.202301270).