NHC-nickel( NHC = N-heterocyclic carbene) complexes are efficient catalysts for the CÀCl bond borylation of aryl chlorides using NaOAc as ab ase and B 2 pin 2 (pin = pinacolato) as the boron source.T he catalysts [Ni 2 (ICy) 4 (m-(h 2 :h 2 )-COD)] (1,I Cy = 1,3-dicyclohexylimidazolin-2-ylidene;C OD = 1,5-cyclooctadiene), [Ni(ICy) 2 (h 2 -C 2 H 4 )] (2), and [Ni(ICy) 2 (h 2 -COE)] (3,C OE = cyclooctene) comparew ell with other nickel catalysts reported previously for aryl-chloride borylation with the advantage that no further ligandsh ad to be added to the reaction. Borylation also proceeded with B 2 neop 2 (neop = neopentylglycolato)a st he boron source. Stoichiometrico xidative addition of different aryl chlorides to complex 1 was highly selectivea ffording trans-[Ni(ICy) 2 (Cl)(Ar)]
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