Metallocenes having a 9-fluorenyl group and another cyclic dienyl group connected by a single carbon having a terminally unsaturated hydrocarbyl substituent wherein the 9-fluorenyl group has a hydrocarbyl substituent in the 4 position, olefin polymerization catalyst systems prepared therefrom, and the use of such catalyst systems are disclosed.

Metallocenes que hace un grupo 9-fluorenyl y otro grupo cíclico del dienyl conectar por un solo carbón que tiene un sustituto no saturado al final del ciclo del hydrocarbyl en donde el grupo 9-fluorenyl tiene un sustituto del hydrocarbyl en la posición 4, sistemas del catalizador de la polimerización del olefin preparados therefrom, y el uso de tales sistemas del catalizador se divulga.

 
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