Asymmetric ansa-Zirconocenes Containing a 2-Methyl-4-aryltetrahydroindacene Fragment: Synthesis, Structure, and Catalytic Activity in Propylene Polymerization and Copolymerization

A set of asymmetric bis-indenyl zirconium SiMe2-bridged ansa-complexes, containing 2-isopropyl-4-arylindenyl and 2-methyl-4-aryltetrahydroindacenyl fragments, have been synthesized. These complexes demonstrate better catalytic activity, stereoselectivty, and polymer molecular weight capability in propylene homo- and copolymerization in comparison to analogues without a tetrahydroindacenyl fragment.

本研究合成了一系列含2-异丙基-4-芳基茚基与2-甲基-4-芳基四氢茚并环戊二烯基结构片段的不对称双茚基二甲基硅基（SiMe₂）桥联ansa-配合物（ansa-complexes）。相较于不含四氢茚并环戊二烯基结构片段的同类配合物，该类配合物在丙烯均聚与共聚反应中展现出更优异的催化活性、立体选择性以及聚合物分子量调控性能。