【摘要】 4-R1 -6-R-2 -Me4 Cp H-Ph OH[R1 =t Bu,R=t Bu(1 ) ;R1 =H,R=t Bu(2 ) ,Ph(3 ) ,Me(4 ) ]经双三甲基硅基化后与 Ti Cl4 反应 ,合成了 4种限制几何构型茂金属催化剂 4-R1 -6-R-2 -Me4 Cp-Ph OTi Cl2 [R1 =t Bu,R=t Bu(5 ) ;R1 =H,R=t Bu(6) ,Ph(7) ,Me(8) ],合成产率有较大提高 .这些茂金属化合物经过 i Bu3Al和Ph3C+ B(C6 F5) - 4活化后对乙烯聚合有很好的催化活性 ,并生成乙基支化聚乙烯 .考察了催化剂结构与活性的关系以及聚合反应条件对催化剂性能的影响 ,并对聚乙烯样品进行了表征更多还原

【Abstract】 Four constrained geometry tetramethylcyclopentadienyl-phenoxytitanium dichlorides 4-R₁-6-R-2-Me₄Cp-PhOTiCl₂[R₁= tBu, R= tBu（5）; R₁=H, R= tBu（6）, Ph（7）, Me（8）] were successfully prepared from the reaction of TiCl₄ with the corresponding trimethylsilyl-functionalized ligands, which was obtained by treating the ligands 4-R₁-6-R-2-Me₄CpH-PhOH[R₁= tBu, R= tBu（1）; R₁=H, R= tBu（2）, Ph（3）, Me（4）] with nBuLi and Me₃SiCl subsequently. The yields are higher than those previously reported. When activated with iBu₃Al and Ph₃C+B（C₆F₅）-₄, complexes 5—8 exhibit a reasonable catalytic activity for ethylene polymerization, producing ethyl branched polyethylenes. Influences of the molecular structure of these complexes and polymerization conditions on their catalytic properties were studied. Polyethylenes obtained with these catalysts were characterized.更多还原