Synthesis of group 4 complexes that contain the tridentate diamido ligands [(ArNCH2CH2)2O]2− (Ar = C6H3-Me2-2,6 or C6H3Pri2-2,6)

Complexes of Zr and Hf of the type [(2,6-R2C6H3NCH2CH2)2O]ZrMe2 (R = Me or Pri) can be activated by [PhNMe2H][B(C6F5)4] or [Ph3C][B(C6F5)4] in chlorobenzene or bromobenzene to yield catalysts for the polymerization of hex-1-ene, but analogous titanium catalysts are relatively poorly behaved.