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Nickel and palladium complexes of enolatefunctionalised N-heterocyclic carbenes

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Central European Journal of Chemistry

Abstract

The reaction of chloroethyltrimethylsilylether with 1-methylimidazole furnishes an ionic liquid that undergoes methanolysis to crystalline 2-hydroxyethylimidazolium chloride (crystal structure presented). Conversion to defined hydroxyethylimidazol-2-ylidene nickel complexes failed, but was accomplished with 1-methyl-3-acetophenyl-imidazolium bromide. The bis(NHCO) nickel(II) chelate is formed, rather than a methallylnickel monochelate, but with nickelocene a monochelate NiCp complex was detected. The bulky 1-(2,6-diisopropylphenyl)-3-(2’-phenyl-enolato)-imidazol-2-ylidene allylpalladium chloride was obtained in pure form. Attempts to generate catalysts for ethylene oligomerization by in situ techniques have failed so far whereas PO ligands, comparable by the P-C diagonal relationship, provide active catalysts.

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Correspondence to Joachim Heinicke.

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Shanmuganathan, S., Kühl, O., Jones, P.G. et al. Nickel and palladium complexes of enolatefunctionalised N-heterocyclic carbenes. cent.eur.j.chem. 8, 992–998 (2010). https://doi.org/10.2478/s11532-010-0071-6

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