Useful Method for the Preparation of Low-Coordinate Nickel(I) Complexes via Transformations of the Ni(I) Bis(amido) Complex K{Ni[N(SiMe3)(2,6-iPr2-C6H3)]2}

A convenient method of preparing two- and three-coordinate Ni(I) complexes of the form L-Ni-I-X (L = PtBu3, PiPr(3), DPPE, NHC; X = -N(SiMe3)(2,6-iPr-C6H3), -O(2,6-Bu-t(2)-4-Me-C6H2)) is reported. Protonation of the easily prepared anionic Ni(I) bis(amido) complex K{Ni[N(SiMe3)(2,6-Pr-i-C6H3)]2} in the presence of an appropriate L-type ligand results in loss of HN(SiMe3)(2,6-Pr-i-C6H3) and trapping of the resulting neutral Ni(I)-amido fragment to yield neutral, paramagnetic, two- and three-coordinate Ni(I) complexes. Protonation of these neutral amido complexes by the bulky phenol HO(2,6-Bu-t(2)-4-Me-C6H2) results in loss of the second amido moiety and trapping by the resulting phenoxide to yield Ni(I)-O(2,6-Bu-t(2)-4-Me-C6H2) complexes. The hapticity of the phenoxide ligand is influenced by the p-accepting ability of the L-type ligand. Where L = (PBu3)-Bu-t, a poor pi-acceptor, the phenoxide acts as a pi-acceptor and adopts a eta(5)-bonding mode through dearomatization of the phenyl ring. When L = NHC, a competent pi-acceptor, the phenoxide acts a pi-donor, adopting a eta(1)-bonding mdoe through the O atom. The modular nature of this synthetic strategy allows variation of both the L- and X-type ligands of the complex in a stepwise fashion and should be extendable to a wide variety of ligand types for new Ni(I) complexes