Titanium Bis(amidinates) Bearing Electron Donating Pendant Arms as Catalysts for Stereospecific Polymerization of Propylene

A series of titanium bis­(amidinate)
complexes containing pendant
arms as one of the amidinate N substituents have been prepared and
studied in the polymerization of propylene after their activation
with MAO and other cocatalysts. The type of pendant arm greatly influences
the reactivity and stereospecificity of the resulting polymers. The
effect of the cocatalyst nature, its amount, and the time of the reaction
have a dramatic effect on the reactivity of a titanium bis­(amidinate)
bis­(dimethylamido) precatalyst containing a furyl group at the pendant
arm.