Synthesis and structures of titanium complexes bearing tetradentate tripodal [OXC] ligands (X = C, P)

We report the synthesis and structures of titanium complexes supported by tripodal mixed-donor [O 2 CC] and [O 2 PC] ligands. Stepwise cyclometallation of a chelating bis(phenoxide) complex led to tetradentate binding of the [O 2 CC] ligand to the titanium center. Phosphination of a Ti-C bond of the [O 2 CC] complex afforded the tripodal [O 2 PC] ligand. We report the synthesis of tripodal [O 2 CC] and [O 2 PC] complexes of titanium via stepwise cyclometallation of 2,2-( ortho -bromo-phenylmethylene)bis(phenol) followed by phosphination of a Ti-C bond.