abstract |
New polycyclic cyclopentadiene compounds having the formula (II) wherein the various substituents and symbols R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , Z 1 and Z 2 and ānā have the meaning specified in the description. These compounds can form metallocene complexes with transition metals, which have shown unusual properties in the (co)polymerization of ethylene and alpha-olefins in general. |