Heteroatom-substituted constrained-geometry complexes. Dramatic substituent effect on catalyst efficiency and polymer molecular weight

被引：104
作者：
Klosin, J
Kruper, WJ
Nickias, PN
Roof, GR
De Waele, P
Abboud, KA
机构：
[1] Dow Chem Co USA, Catalysis Lab, Midland, MI 48674 USA
[2] Univ Florida, Dept Chem, Gainesville, FL 32611 USA
来源：
ORGANOMETALLICS | 2001年 / 20卷 / 13期
关键词：
D O I：
10.1021/om010016d
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The new constrained-geometry complexes (CGC) [(eta (5)-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 amino substituents attached to a second and third indenyl position. Four of the new complexes (1a-4a) have been characterized by single-crystal X-ray analysis. An ethylene-octene copolymerization study revealed an enormous substituent effect, both on the catalysts' activity and the molecular weight of produced polymers. The 3-amino-substituted complex 4b exhibits the highest catalytic activity and forms the highest molecular weight ethylene/octene copolymers that have ever been reported for this class of catalysts.
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页码：2663 / 2665
页数：3
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