Hydride abstraction from the heterocyclic carbene borane adducts (NHC)BH C F (NHC: IMes or IMe ) gave the B-H containing [(NHC)B(H)C F ] borenium cations. They added carbon monoxide to give the respective [(NHC)B(H)(C F )CO] boron carbonyl cations. Carbon nucleophiles add to the boron carbonyl to give [B](H) acyls. Hydride reduced the [B]CO cation to hydroxymethylborane derivatives.
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| http://dx.doi.org/10.1002/anie.202009353 | DOI Listing |
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