New iron-based bis(imino)pyridine and acetyliminopyridine complexes as single-site catalysts for the oligomerization of ethylene

作者：Bluhm ME^*; Folli C; Doring M

来源：Journal of Molecular Catalysis A: Chemical , 2004, 212(1-2): 13-18.

DOI：10.1016/j.molcata.2003.11.003

• oligomerization
• single-site catalysts
• ethylene
• bis(imino)pyridines
• acetylimino-pyridines

New iron-based bis(imino)pyridine complexes 6, 7 and the acetyliminopyridine complex 8a are active catalysts together with the co-catalyst MAO for the oligomerization of ethylene. The ligands 1-4 with electron donating methoxy- and electron withdrawing trifluoromethyl-substituents react with FeCl(2) (thf)(2) to the Fe(II) complexes 6-8a. Especially p-methoxy substituents in 6b increase the selectivity in the production of alpha-olefins. The distribution of oligomers obtained in the catalyzed ethylene oligomerization with 5-8a follows Schulz-Flory rules for oligomers >C(4). The probability of chain propagation ot is increased by lowering the reaction temperature, while higher pressure of the ethylene gas in the reaction has nearly no effect on the ce-values.

• 出版日期2004-4-2