C,C-coupling of RC⋮C- ligands (R =
Me3C,
Me3Si) coordinated to Nast-type nickelate centers
is
initiated by I2 and regioselectively steered by
trimethylphosphine to afford the (1-(trimethylphosphonio)-σ-vinyl)nickel complexes
NiI2[C(PMe3)C(C⋮CR)R]PMe3.
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