ω-Phenylalkyl-substituted zirconocene dichloride complexes as catalyst precursors for homogeneous ethylene polymerization
作者:Erik H Licht、Helmut G Alt、M.Manzurul Karim
DOI:10.1016/s0022-328x(00)00009-7
日期:2000.4
The reaction of ω-phenyl-1-bromoalkanes with cyclopentadienyl sodium, indenyl lithium or fluorenyl lithium forms ω-phenylalkyl-substituted ligand precursors in high yields. The corresponding anions react with zirconium tetrachloride to give ω-phenylalkyl-substituted zirconocene dichloride complexes. After activation with methylaluminoxane, these complexes are highly active catalysts for homogeneous
ω-苯基-1-溴代烷烃与环戊二烯基钠,茚基锂或芴基锂的反应以高收率形成了ω-苯基烷基取代的配体前体。相应的阴离子与四氯化锆反应,得到ω-苯基烷基取代的二茂锆二氯化物络合物。用甲基铝氧烷活化后,这些络合物是用于均相乙烯聚合的高活性催化剂。ω-苯基取代基的性质在很大程度上决定了催化剂的聚合活性。比较了28种新配合物的聚合结果。