Boron at the top: Reaction of IMes⋅BBr3 (IMes=1,3-bis(2,4,6-trimethylphenyl) imidazol-2-ylidene) with Na[Co(CO)4] afforded the trimetalloboride [(CO)9Co3(μ3-B⋅IMes)] with high selectivity. This species has a tetrahedral geometry with an electron-precise bonding situation, which is uncommon for a μ3 boride complex. It can be considered the missing link between a tetrahedral μ3 borylene (nonclassical) and planar μ3 boride (electron-precise) complexes.
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