Abstract
Zirconocene compounds having ether bonds at the substituent of cyclopentadienyl ligand, [ η 5-C 5H 4(CH 2) n OCH 2CH 2OCH 2CH 3] 2ZrCl 2 ( n=2, 4, 6, 8) and [ η 5-C 5H 4CH 2CH 2OCH 2CH 3] 2ZrCl 2, were prepared and tested for ethylene polymerization catalysts with methylaluminoxane as a cocatalyst. The presence of oxygen atom close to the metal center drastically reduced the polymerization activity. It increased as the distance between zirconium and oxygen atom increased and showed a maximum when n was 6.
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