Nickel(II), Palladium(II), and Platinum(II) η³-Allyl Complexes Bearing a Bidentate Titanium(IV) Phosphinoamide Ligand: A Ti←M₂ Dative Bond Enhances the Electrophilicity of the π-Allyl Moiety

Three Ti−M₂ (M₂ = Ni, Pd, Pt) heterobimetallic complexes, [(η³-methallyl)M₂(Ph₂PN^tBu)₂TiCl₂](OTf), were synthesized in which a Ti^IV←M₂ interaction was suggested by crystallography and DFT calculations. The Ti^IV←M₂ interaction enhanced electrophilicity of the η³-methallyl ligand of M₂, leading to high reactivity of the η³-methallyl moiety with Et₂NH compared with that of the dppp analogue.