Ar = 4-SiMe 3 Phenyl (9), 4-MePhenyl (10)) were synthesized from the reaction of a corresponding cyclopentadienyl titanium trichloride derivative with the lithium salt of a relevant phenol. The molecular structures of complexes 6, 7 and 8 were determined by X-ray crystallography. Upon activation with i Bu 3 Al and Ph 3 CB(C 6 F 5 ) 4 , all mononuclear complexes 5-8 exhibit good catalytic activities for propylene polymerization, whereas the binuclear complexes 9 and 10 show lower catalytic

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... ties under the same polymerization conditions. 13 C NMR, DSC and GPC analysis indicates the produced polymers are atactic polypropylene with relatively high molecular weight. It was found that the substituents on both the cyclopentadienyl and aryloxy ligands of these complexes show obvious influence on the molecular weight of the resultant polymers with complex 5 producing the highest molecular weight atactic polypropylene. Complexes 5, 6 and 7 were also tested as catalysts for copolymerization of propylene with 1-hexene and copolymers with 1.2-10.1% comonomer incorporation were obtained in reasonable catalytic activity. This journal is Synthesis of complexes 5-10 Complexes 5-8 were synthesized in relatively high yields (75-80%) by reactions of 2,6-i Pr 2 C 6 H 3 OLi (Scheme 2) with the cyclopentadienyltitanium trichloride derivatives 1-4, respectively. These reactions were usually carried out in toluene at 80 • C for 12 h to make the reaction go to completion. The synthetic reaction 2526 | Dalton Trans., 2010, 39, 2525-2535 This journal is