| Abstract
| - The new constrained-geometry complexes(CGC) [(η5-C9H5X)(SiMe2-t-Bu)TiR2 (X = 2-OEt (1a,b),2-NMe2 (2a,b) , 3-OMe (3a,b), 3-NC4H4 (4a,b); R = Cl,Me) have been synthesized with alkoxy and aminosubstituents attached to a second and third indenylposition. Four of the new complexes (1a−4a) have beencharacterized by single-crystal X-ray analysis. An ethylene/1-octene copolymerization study revealed an enormous substituent effect, both on the catalysts' activityand the molecular weight of produced polymers. The3-amino-substituted complex 4b exhibits the highestcatalytic activity and forms the highest molecular weightethylene/octene copolymers that have ever been reportedfor this class of catalysts.
- New constrained-geometry complexes have been synthesized with alkoxy and amino substituents attached to a second and third indenyl position (1−4). Ethylene/1-octene copolymerization studies revealed an enormous substituent effect, on both the catalysts' activity and the molecular weight of the polymers produced. The 3-amino-substituted complex 4b was found to have the highest catalytic activity and form the highest molecular weight ethylene/octene copolymers that have ever been reported for this class of catalysts.
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