Oxidative addition of aryl halides: routes to mono- and dimetallic nickel amino-bis-phosphinimine complexes.

Oxidative addition of an aryl-halide to Ni(COD)2 in the presence of an equivalent of amino-bis-phosphinimine ligand affords complexes of the form [HN(CH2CH2NPPh3)2Ni-Ar][X] (Ar = C6H4F, C6H5, X = Cl, Br) while the analogous reactions with 2 equivalents of Ni yield the amido-bridged complexes N(CH2CH2NPPh3)Ni2Br3 and N(1,2-C6H4NPPh3)Ni2Br3.