B. Lee, X. Bu, G. Bazan
Nov 10, 2001
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Organometallics
Abstract
The synthesis, characterization, and reactivity toward ethylene of pyridinecarboxamidato complexes of nickel are reported. These compounds are isoelectronic to α-iminocarboxamidato complexes, which are useful ethylene polymerization catalysts. Addition of a benzene solution containing N-phenyl-2-pyridinecarboxamide and B(C6F5)3 to bis(methallyl)nickel results in the formation of [N-phenyl-2-pyridinecarboxamidatotris(pentafluorophenyl)borate-κ2N,N]Ni(η3-CH2CMeCH2) (3) in 93% yield. A similar procedure using N-(2,6-diisopropyl)phenyl-2-pyridinecarboxamide provides [N-(2,6-diisopropyl)phenyl-2-pyridinecarboxamidatotris(pentafluorophenyl)borate-κ2N,N]Ni(η3-CH2CMeCH2) (4) in 92% yield. The solid-state structures of 3 and 4 were determined by X-ray diffraction techniques. The intramolecular metrical parameters are consistent with substantial partial positive charge at the nickel atom. Deprotonation of N-(2,6-diisopropyl)phenyl-2-pyridinecarboxamide in THF with KH, followed by addition to Ni(η3-CH2C6H5)Cl(PMe3) ...