Highly active and cis-1,4 selective polymerization of 1,3-butadiene catalyzed by cobalt(II) complexes bearing α-diimine ligands
作者:Xiangyu Jia、Heng Liu、Yanming Hu、Quanquan Dai、Jifu Bi、Chenxi Bai、Xuequan Zhang
DOI:10.1016/s1872-2067(12)60625-1
日期:2013.8
synthesized for comparison. The structures of complexes 3i, 3k, and 4a were further analyzed by X‐ray crystallography. When the Co(II) complexes were activated with ethylaluminum sesquichloride, they exhibited high catalytic activity for 1,3‐butadiene polymerization. The polymers produced have high cis‐1,4 stereoregularity (up to 98.0%) and high molecular weights (Mn = 1×10^4 - 1×10^5). The substituent ligand
合成了一系列带有α-二亚胺配体的钴(II)配合物,并通过元素和光谱分析对其进行了表征。这些配合物的通式为 [ArN = C(Me)-(Me)C = NAr]CoCl2 (Ar = C6H5, 3a; 4-MeC6H4, 3b; 4-MeOC6H4, 3c; 4-FC6H4, 3d; 4-ClC6H4 , 3e; 2-MeC6H4, 3f; 2-EtC6H4, 3g; 2-iPrC6H4, 3h; 2, 4, 6-Me3C6H2, 3i; 2, 6-Et2C6H3, 3j; 2, 6-iPrC6H3). 还合成了 2,6-双[(2,6-二异丙基苯基亚氨基)乙基]吡啶 CoCl2 (4a) 以进行比较。通过X射线晶体学进一步分析了配合物3i、3k和4a的结构。当 Co(II) 配合物用倍半氯化乙基铝活化时,它们对 1,3-丁二烯聚合表现出很高的催化活性。生产的聚合物具有高顺 1,4 立体规整度(高达