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Catalytic Trimerization of Ethylene with Highly Active Half‐sandwich Titanium Complexes Bearing Pendant p ‐Fluorophenyl Groups
Author(s) -
Wang Chen,
Huang JiLing
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690261
Subject(s) - chemistry , ethylene , substituent , catalysis , fluorine , titanium , selectivity , medicinal chemistry , ring (chemistry) , polymer chemistry , stereochemistry , organic chemistry
Two new complexes [ η 5 ‐C 5 H 4 CMe 2 ‐( p ‐fluorophenyl)]TiCl 3 ( 1 ) and [ η 5 ‐C 5 H 4 C(cyclo‐C 5 H 10 )‐( p ‐fluoro‐phenyl)]TiCl 3 ( 2 ) were synthesized and characterized. Their activities and selectivities for trimerization of ethylene were investigated. The introduction of fluorine atom greatly weakened the arene coordination, but this disadvantageous factor can be eliminated by introduction of a bulky substituent, such as cyclo‐C 5 H 10 , to the bridging carbon linked to the Cp ring. The combinative effect of the fluorine substitute and the bridging unit can make complex 2 as a highly active and selective catalyst for ethylene trimerization. Its productivity and selectivity for 1‐hexene can reach 1024.0 kg·mol −1 ·h −1 and 99.3% respectively.