Abstract
The effects of replacing one of the 2-phenylindenyl-type ligands in bis(2-phenylindenyl)zirconium dichloride, (2-PhInd)2ZrCl2 (7), a catalyst precursor for the production of elastomeric polypropylene (ELPP-7), with a cyclopentadienyl-type ligand have been studied. The mixed-ring compounds: (pentamethylcyclopentadienyl)(2-phenylindenyl)zirconium dichloride, Cp*(2-PhInd)ZrCl2, (8), (pentamethylcyclopentadienyl)(1-methyl-2-phenylindenyl)zirconium dichloride, Cp*(1-Me-2-PhInd)ZrCl2 (9), and (cyclopentadienyl)(2-phenylindenyl)zirconium dichloride, Cp(2-PhInd)ZrCl2 (10), have been synthesized through the reaction of the corresponding lithium indenide with C5R5ZrCl3 (8 and 9: R = CH3; 10: R = H). Crystal structures have been determined for complexes 8 and 9. The behavior of the catalysts derived from complexes 8, 9, and 10 upon their activation by methylaluminoxane (MAO) for ethylene and propylene polymerization has been studied. Of all mixed-ring catalysts only 8/MAO produces elastomeric polypropylene (ELPP-...
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