Boron in the Coordination Spheres of Three Transition‐Metal Atoms: Syntheses and Structures of Metalloborylenes Stabilized by a Transition‐Metal Base

Naked boron: Reaction of the bromoborylene complex [(η5-C5Me5)(OC)Fe(μ-CO)(μ-BBr)Pt(PCy3)Br] with [M(PCy3)2] (M=Pd, Pt) leads to complexes featuring the unprecedented coordination of one boron atom to three transition-metal centers (see picture). According to structural and DFT studies, the new compounds are best described as metalloborylene complexes stabilized by transition-metal bases.