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The isolable anionic oxoborane 3 and thioxoborane 4 have been assembled using a 1,2-bis(imino)acenaphthene ligand (Dip-BIAN). Structural characterization and DFT calculations confirmed that two compounds contain terminal doubly bonded B＝E (E = O, S) groups, respectively, in which only the B＝O group is associated with imidazolium via a hydrogen bond. [ABSTRACT FROM AUTHOR]

A rigid β‐diketiminate ligand was used to synthesize a cationic hydroxyborane and an anionic oxoborane. The anionic oxoborane has a negatively charged oxo‐group, which possesses a 1.301(3) Å B–O double bond and interacts with the hydrogen bond of an imidazolium cation. Theoretical calculations successfully illustrate the unsaturated nature of the B–O bond and the stability of the conjugated C3N2B‐ring in the oxoborane. The isolation of the new oxoborane compound offers promising approaches to unsaturated boron species. [ABSTRACT FROM AUTHOR]