Nickel(II) complexes bearing phosphinooxazoline ligands: Synthesis, structures and their ethylene oligomerization behaviors
作者:Xiubo Tang、Dongheng Zhang、Suyun Jie、Wen-Hua Sun、Jiutong Chen
DOI:10.1016/j.jorganchem.2005.05.026
日期:2005.9
or Et2AlCl, these complexes exhibited considerable to high activity of ethylene oligomerization. The ligands environments and reaction conditions significantly affect their catalytic activities, while the highest oligomerization activity (up to 1.18 × 106 g · mol−1(Ni) · h−1) was observed for 4d at 20 atm of ethylene. Incorporation of 2–4 equivalents of PPh3 as auxiliary ligands in the 4a–f/MAO catalytic
合成了一系列由不对称膦-恶唑啉(PHOX)连接的Ni(II)配合物4a - f,并通过元素分析和红外光谱对其进行了表征,并通过X射线晶体学分析证实了配合物4c - 4e的结构。所有衍生物均显示出镍中心和配位原子扭曲的四面体几何形状。在用甲基铝氧烷(MAO)或Et 2 AlCl活化后,这些络合物表现出相当高的乙烯低聚活性。配体的环境和反应条件显着影响其催化活性,而最高的低聚活性(高达1.18×10 6 g·mol -1在20atm的乙烯下观察到(Ni)·h -1)4d。在4a – f / MAO催化体系中掺入2–4当量的PPh 3作为辅助配体导致更高的活性和更长的催化寿命。