TY - JOUR A1 - Yau, Johnathon A1 - Hunt, Kaarel E. A1 - McDougall, Laura A1 - Kennedy, Alan R. A1 - Nelson, David J. T1 - Half-sandwich nickel(II) complexes bearing 1,3-di(cycloalkyl)imidazol-2-ylidene ligands JF - Beilstein Journal of Organic Chemistry PY - 2015/// VL - 11 SP - 2171 EP - 2178 SN - 1860-5397 DO - 10.3762/bjoc.11.235 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.11.235 KW - catalysis KW - cross-coupling KW - N-heterocyclic carbenes KW - nickel N2 - Two new nickel catalysts have been prepared using a convenient procedure where nickelocene, the NHC·HBF4 salts, and [Et4N]Cl were heated in THF using microwave irradiation. The resulting [NiCl(Cp)(NHC)] complexes are air- and moisture stable in the solid state, and represent two new members of this valuable and practical class of nickel catalysts. The new species were fully characterised using methods including NMR spectroscopy and X-ray crystallography. When tested in model Suzuki–Miyaura cross-coupling reactions, these complexes were found to be active for the cross-coupling of aryl bromides and aryl chlorides. ER -