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

作者：Sun, Yanjie; Xu, Bo; Shiono, Takeshi^*; Cai, Zhengguo^*

来源：Organometallics, 2017, 36(16): 3009-3012.

DOI：10.1021/acs.organomet.7b00415

• ALPHA-OLEFIN POLYMERIZATION
• METAL-CATALYSTS
• METALLOCENE COMPLEXES
• TITANIUM COMPLEXES
• BLOCK-COPOLYMERS
• FLUORENYL LIGAND
• ETHYLENE
• STEREOCONTROL
• POLYPROPYLENE
• POLYETHYLENE

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.

• 出版日期2017-8-28
• 单位东华大学