American Chemical Society
om7b00415_si_001.pdf (480.77 kB)

Highly Active ansa-(Fluorenyl)(amido)titanium-Based Catalysts with Low Load of Methylaluminoxane for Syndiotactic-Specific Living Polymerization of Propylene

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journal contribution
posted on 2017-08-11, 16:19 authored by Yanjie Sun, Bo Xu, Takeshi Shiono, Zhengguo Cai
ansa-Dimethylsilylene­(fluorenyl)­(amido)titanium complexes bearing various electron-donating substituents are synthesized and applied to propylene polymerization by the use of MMAO/2,6-di-tert-butyl-4-methylphenol as a cocatalyst. The complexes containing adamantylamido ligands (1a,b) show unexpectedly high activity (31150 kg of polymer (mol of Ti)−1 h–1) with a low Al:Ti ratio of 20. The catalysts also promote syndiotactic-specific living polymerization to produce propylene-ethylene block copolymers.