460353-33-7Relevant academic research and scientific papers
Synthesis and polymerization catalytic properties of aryl-substituted tetramethylcyclopentadienyl zirconocenes
Deng, Xiaobin,Wang, Baiquan,Xu, Shansheng,Zhou, Xiuzhong,Yang, Ling,Li, Yufei,Hu, Youliang,Li, Yang,Zou, Fenglou
, p. 57 - 64 (2008/10/08)
A series of aryl-substituted tetramethylcyclopentadienyl zirconocenes (C5Me4C6H4X-4)Cp′ MCl2 [CP′ = C5H5, X = H (5), Me (6), Cl (7) or OMe (8); Cp′ = Ind, X = H (9), Me (10) or Cl (11); Cp′ = 2-Ph-Ind, X = H (12)] and (C5Me4C6H4X-4)2 ZrCl2 [X = H (13), Me (14), Cl (15)], with different substituents at the 4-position of phenyl, have been prepared by the reaction of the corresponding ligands (C5Me4HC6H4X-4) [X = H (1), Me (2), Cl (3) or OMe (4)] with n-BuLi, ZrCl4 and Cp′Li or with n-BuLi and ZrCl4. Ethylene polymerization with these complexes in combination with MAO has been studied. The electron donor (Me) at the 4-position of phenyl led to an increase in catalytic activity while the electron-withdrawing group (Cl) and the strong π donor (OMe) led to its decrease. Complexes 5, 6, 9 and 10 exhibited very high activities, but 13-15 showed much lower activities due to the bulky steric effect. The molecular structure of 5 has been determined by X-ray diffraction. The relationship between structures of catalysts and catalytic activities were discussed.
