Highly active and selective ethylene oligomerization catalysts: Asymmetric 2,6-bis(imino)pyridyl iron (II) complexes with alkyl and halogen substitutients
作者:Guangyong Xie、Tingcheng Li、Aiqing Zhang
DOI:10.1016/j.inoche.2010.07.003
日期:2010.10
Abstract A series of asymmetric 2,6-bis(arylimino)pyridines with alkyl and halogen substitutients on different iminoaryl rings and corresponding iron (II) complexes ([2-(Ar 1 N = CCH 3 )-6-(Ar 2 N = CCH 3 )C 5 H 3 N]FeCl 2 , 3a – 3j ) are synthesized and characterized. These Fe(II) complexes are highly active for ethylene oligomerization with high selectivity for linear α-olefins. The oligomer distributions
摘要 一系列在不同亚氨基芳基环上具有烷基和卤素取代基的不对称 2,6-双(芳基亚氨基)吡啶和相应的铁 (II) 配合物 ([2-(Ar 1 N = CCH 3 )-6-(Ar 2 N = CCH 3 )C 5 H 3 N]FeCl 2 , 3a – 3j ) 被合成和表征。这些 Fe(II) 配合物对乙烯低聚具有高活性,对线性 α-烯烃具有高选择性。低聚物的分布可以通过烷基空间效应和卤素电子效应的协同作用进行调节,C 6 -C 16 的产量可达80%以上,最高选择性为87.5%,对3 g (Ar 1 = 2-乙基苯基,Ar 2 = 2-氟苯基),比由它们的甲基或氟取代的对称对应物催化的催化高 15-30%。