Abstract
Oxidative substitution of tetrakis(triphenylphosphine) nickel(0) with a chloro- or bromo-pyridine takes place in toluene at room temperature to afford a dimeric complex, [NiX(σ-pyridyl) (PPh3)]2. The σ-pyridyl nickel(II) complex is very stable and has a strong preference for the dimeric structure, the bridging ligand being readily replaced by other halide and pseudo halide ions. [NiCl (2σ-C5H4N) (PPh3)]2 acts as a very powerful catalyst for completely selective cross coupling between 2-chloropyridine and methylmagnesium bromide.
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