Abstract:Although Schleyer's computations in 1979 predicted that the ground state of the parent diborirane features a planar‐tetracoordinate carbon atom (anti van't Hoff–Le Bel geometry), this work demonstrates that substitution of C coupled with N‐heterocyclic carbene (NHC) coordination provides access to isolable diborirane derivatives 3 and 4 with van't Hoff–Le Bel geometry. Species 3 and 4 are isoelectronic with cyclopropane and the highly strained B2C rings feature 2c–2e bent σ bonds. Consequently, the B−B and B−C… Show more
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