Isoprene Polymerization with Pyrazolylimine Cobalt(II) Complexes: Manipulation of 3,4‐Selectivities by Ligand Design and Use of Triphenylphosphine
作者:Liang Fang、Wenpeng Zhao、Chao Han、Heng Liu、Yanming Hu、Xuequan Zhang
DOI:10.1002/ejic.201801107
日期:2019.2.7
with diethylaluminum chloride (DEAC) and methylaluminoxane (MAO) as cocatalysts, the present cobalt complexes displayed high activity toward isoprene polymerization, affording cis‐1,4/3,4‐polyisoprenes. Polymerization parameters have significant influence on the polymerization behavior. Additionally, incorporation of the external donor triphenylphosphine led to a switch in selectivity of the system from
合成并很好地表征了一系列吡唑基亚胺CoCl 2配合物。这些复合物的单晶结构和配位几何结构通过X射线衍射证实,揭示了二聚体和单体结构,从而分别扭曲了三角双锥体和扭曲的四面体几何形状。结合二乙基氯化铝(DEAC)和甲基铝氧烷(MAO)作为助催化剂,本发明的钴配合物对异戊二烯聚合反应显示出高活性,提供了顺-1,4 / 3,4-聚异戊二烯。聚合参数对聚合行为有重要影响。此外,外部供体三苯膦的引入导致系统的选择性从顺式转换-1,4到3,4,提供了一种有效的方法来大规模调整3,4-部分。