Abstract
Hydride abstraction from the heterocyclic carbene borane adducts (NHC)BH2 C6 F5 (NHC: IMes or IMe4 ) gave the B-H containing [(NHC)B(H)C6 F5 ]+ borenium cations. They added carbon monoxide to give the respective [(NHC)B(H)(C6 F5 )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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