Bis(di-, tri- or tetra-substituted-cyclopentadienyl)zirconium dihalides represented by the following general formula [I] are provided,
( wherein R¹ denotes a substituent group on the cyclopentadienyl ring which is an alkyl radical of 1 to 5 carbon atoms; R12-C₅H₃ stands for a di-substituted cyclopentadienyl radical; and X is a halogen atom ).
This compound, when combined with an aluminoxane represented by the following general formula [VII], gives a high-activity catalyst for the synthesis of polyolefins,
( wherein m is an integer of 4 to 20; and R² denotes a hydrocarbyl radical ).
提供了由以下通式[I]表示的双(二、三或四取代
环戊二烯基)二卤化
锆,(其中 R¹ 表示
环戊二烯环上的取代基,该取代基为 1 至 5 个碳原子的烷基;R12-C₅H₃ 表示二取代
环戊二烯基;X 为卤素原子)。 该化合物与由以下通式[VII]表示的铝氧烷结合后,可得到一种用于合成聚烯烃的高活性催化剂,(其中 m 为 4 至 20 的整数;R² 表示烃基)。