A T-shaped Ni[κ2-(CF2)4-] NHC complex: unusual Csp -F and M-CF bond functionalization reactions
Nicholas O Andrella1, Alexandre J Sicard1, Serge I Gorelsky1
1Department of Chemistry and Centre for Catalysis Research and Innovation(CCRI) , University of Ottawa , 30 Marie Curie , Ottawa , ON K1N 6N5 Canada.
Abstract:
A T-shaped octafluoronickelacyclopentane-NHC complex is prepared and characterized. While the solid-state structure includes a weak isopropyl-CH3 agostic interaction, the reactivity of this complex with Lewis- and Brønsted acids is clearly enhanced by its low coordination number. Reaction with Me3SiOTf, for example, yielded a rare metal-heptafluorocyclobutyl complex whereas carboxylic acids gave substitution at the α-carbon and/or Ni-CF bond protonolysis to afford thermally robust 4H-octafluorobutyl Ni complexes.
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