New sterically hindered unbridged zirconocene complexes with 1,2-diphenylcyclopentadienyl ligands: synthesis, structure and properties as olefin polymerization catalysts
作者:Fan Zhang、Ying Mu、Ligang Zhao、Yuetao Zhang、Weiming Bu、Congxi Chen、Huimin Zhai、Han Hong
DOI:10.1016/s0022-328x(00)00498-8
日期:2000.10
New unbridged zirconocene complexes, bis(1,2-diphenylcyclopentadienyl)zirconium dichloride (3) and bis(4-methy-1,2-diphenylcyclopentadienyl)zirconium dichloride (4) have been synthesized in high yield by reaction of ZrCl4 with the lithium salt of 1,2-diphenylcyclopentadiene (1) or 4-methyl-1,2-diphenylcyclopentadiene (2), respectively. X-ray crystallographic analysis reveals both complexes are in racemic-like
通过ZrCl 4与锂的反应,高收率合成了新的未桥接锆茂配合物双(1,2-二苯基环戊二烯基)二氯化锆(3)和双(4-甲基-1,2-二苯基环戊二烯基)二氯化锆(4)。1,2-二苯基环戊二烯的盐(1)或4-甲基-1,2-二苯基环戊二烯的盐(2)。X射线晶体学分析表明,两种络合物均呈消旋状构象,固态时具有接近C 2的对称性。当被甲基铝氧烷(MAO)3和4活化时在较低的Al:Zr比下,对乙烯聚合具有适度的催化活性,可生产具有高熔融转变温度的高分子量(> 10 6)聚乙烯。3和4均在被MAO活化后以相对较高的催化活性产生平均分子量约为10 10 g g mol -1的无规立构丙烯低聚物。