Ansa-Zirconocene polymerization catalysts with anelated ring ligands-effects on catalytic activity and polymer chain length
U Stehling, J Diebold, R Kirsten, W Roell… - …, 1994 - ACS Publications
U Stehling, J Diebold, R Kirsten, W Roell, HH Brintzinger, S Juengling, R Muelhaupt…
Organometallics, 1994•ACS PublicationsThe dimethylsilyl-bridged zirconocene complexes (CH3) 2Si (benz [e] indenyl) 2ZrCl2 (I)
and (CH3) 2Si (2-methylbenz [e] indenyl) 2ZrCl2 (II) have been synthesized; the structure of
II was determined by X-ray diffraction. Complex I is about 4 times more active in
polymerizing propene than its bis (indenyl) analog when activated with methylaluminoxane
(MAO) under otherwise identical conditions. The resulting catalyst system polymerizes also
the 7-branched olefins 3-methyl-l-butene and 3-methyl-1-pentene. Polymers produced with …
and (CH3) 2Si (2-methylbenz [e] indenyl) 2ZrCl2 (II) have been synthesized; the structure of
II was determined by X-ray diffraction. Complex I is about 4 times more active in
polymerizing propene than its bis (indenyl) analog when activated with methylaluminoxane
(MAO) under otherwise identical conditions. The resulting catalyst system polymerizes also
the 7-branched olefins 3-methyl-l-butene and 3-methyl-1-pentene. Polymers produced with …
The dimethylsilyl-bridged zirconocene complexes (CH3) 2Si (benz [e] indenyl) 2ZrCl2 (I) and (CH3) 2Si (2-methylbenz [e] indenyl) 2ZrCl2 (II) have been synthesized; the structure of II was determined by X-ray diffraction. Complex I is about 4 times more active in polymerizing propene than its bis (indenyl) analog when activated with methylaluminoxane (MAO) under otherwise identical conditions. The resulting catalyst system polymerizes also the 7-branched olefins 3-methyl-l-butene and 3-methyl-1-pentene. Polymers produced with complex II have molecular weights about 4 times higher than those obtained with complex I under identical conditions. The a-methyl substituents of II appear to block those chain terminations which arise from dH transfer directly to a coordinated monomer molecule.
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