Neutral s<i>p</i>²–s<i>p</i>³ Diboranes: Structures, Reactivities, and Applications in Organic Synthesis

Neutral s p 2 – s p 3 diboranes are characterized by a polarized BB single bond between two electronically and structurally distinct boryl groups, featuring one s p 2 ‐hybridized (three‐coordinate) boron center and one s p 3 ‐hybridized (four‐coordinate) boron center with a neutral Lewis base ligand. Their unique structures and properties have attracted growing research interest, particularly in exploring their reactivities and applications in CB bond formation reactions. This review summarizes recent advancements in the chemistry of neutral s p 2 –s p 3 diboranes, emphasizing their syntheses, structural features, reactivities, and emerging applications as diboron reagents in organic synthesis.