Highly selective propylene dimerization catalyzed by C1‐symmetric zirconocene complexes
A series of ethylene‐bridged C 1‐symmetric ansa‐(3‐R‐indenyl)(fluorenyl) zirconocene complexes (1, 2, 3, 4, 5, 6, 7, 8, 9) incorporating a pendant arene substituent on the 3‐position of indenyl ring have been synthesized. The structure of complex 4 was further confirmed by X‐ray diffraction analysis. When activated with methylaluminoxane, four sterically less encumbered complexes 1, 2, 4 and 5 could catalyze the
dimerization of propylene in toluene at 100°C to afford 2‐methyl‐1‐pentene with high selectivities up to 95.7–98.4% and moderate activities of 2.00 × 104 to 7.89 × 104 g
(mol‐Zr⋅h)−1. Copyright © 2014 John Wiley & Sons, Ltd.
A series of ethylene bridged C
1‐symmetric ansa‐(3‐R‐indenyl)(fluorenyl) zirconocene complexes incorporating a pendant arene substituent on the 3‐position of indenyl ring have been synthesized, which are highly selective for propylene
dimerization to afford 2‐methyl‐1‐pentene with selectivities up to 95.7~98.4% at 100°C in the presence of MAO.
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