Synthesis and Hydroboration of a Mixed‐Donor Iminoboryl Complex of Platinum

The first iminoboryl complex with a non-phosphine donor ligand has been isolated and fully characterized. The structural and spectroscopic parameters of the PtII complex, which bears one phosphine and one N-heterocyclic carbene ligand, suggest that the Pt center backdonates less to the iminoboryl ligand than in conventional (iminoboryl)bis(phosphine) complexes, despite the presence of a strongly σ-donating NHC ligand. This iminoboryl complex was found to undergo facile hydroboration with catecholborane, leading to an N-borylated hydroboryl complex.