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The synthesis, characterization, and reactivity of an iminoborane-N-heterocyclic carbene (NHC) adduct were described. The reaction of DmpNHB(OEt)Br [1; Dmp = 2,6-bis(2,4,6-trimethylphenyl)phenyl] with 2 equiv of 1,3-diimethyl-4,5-dimethylimidazol-2-ylidene (IMe4) resulted in the formation of an iminoborane-NHC complex 2. Both X-ray analysis and density functional theory calculations revealed the double-bond character of the B═N bond in 2. Interestingly, compared with the corresponding Lewis-base-free iminoborane, 2 features a nitrogen at
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