Organonickel(II) Complexes Containing Carbon-bonded Heterocycles as a Ligand

Article abstract of DOI:10.1246/bcsj.53.139

Oxidative addition reactions of 2- and 3-chloropyridines and of 2-chloropyrazine to tetrakis(triphenylphosphine)nickel(0) occurred in toluene at ambient temperature to afford dinuclear nickel(II) complexes containing carbon-bonded heterocycles as a ligand.They are quite stable and the bridging chloride was readily substituted by other halides and pseudohalides preserving the dinuclear structure. 8-Chloroquinoline yielded a mononuclear complex as an exception.These novel organonickel(II) complexes were characterized by analytical and molecular weight data together with IR, 1H NMR, and 13C NMR spectra.Di-μ-chloro-bis(2-pyridyl)bis(triphenylphosphine)dinickel(II) was found to be an excellent catalyst for selective cross coupling of 2-chloropyridine with methylmagnesium bromide.