SYNTHESIS, CHARACTERIZATION AND MONOALKENE POLYMERIZATION ACTIVITY OFTETRAPHENYL)-ETA(5)-CYCLOPENTADIENYL]ZIRCONIUM(IV) DICHLORIDE

The title complex (1) has been prepared by reaction of ZrCl4 with 1,2, 3,4-(tetraphenyl)cyclopenta-1,3-dienyl lithium (2). The phenyl substit uents on the metallocene ligands exert both steric and electronic effe cts on the active site obtained by activation of 1 with MAO. Thus this catalytic system shows lower polymerization activity than in case of unsubstituted or methyl-substituted ligands and leads to the formation of ethylene oligomers.