Synthesis and Scale-up of Imino–Enamido Hafnium and Zirconium Olefin Polymerization Catalysts
作者:Philip P. Fontaine、Ruth Figueroa、Scott D. McCann、Darrek Mort、Jerzy Klosin
DOI:10.1021/om400189w
日期:2013.5.24
imino–enamido hafnium and zirconium trimethyl derivatives were very similar to those of the tribenzyl analogues. A scale-up of the hafnium trimethyl derivative, performed on a 255 g scale, was accomplished in an overall yield of 57% in four steps starting with commercially available cyclohexa-1,2-dione. Hafnium and zirconium complexes derived from two isomeric imino–enamine ligands each resulted in very high
通过使亚氨基-烯胺配体与and或四氯化锆的混合物与四当量的甲基溴化镁在甲苯中反应,可以高收率制备新的亚氨基-ami氨基ha和三甲基锆配合物。在配体合成的最后一个步骤中,开发了一种显着改善的亚胺形成反应,该反应涉及酮-烯胺与通过混合0.55当量的四氯化钛和5.5当量的n的原位形成的试剂之间的反应。-丁胺。乙烯/ 1-辛烯在120°C下的聚合反应评估表明,亚氨基enen和三甲基锆锆的聚合特性与三苄基类似物的聚合特性非常相似。以255克规模进行的三甲基ha衍生物的放大,从市售的环己基1,2-二酮开始,分四个步骤以57%的总收率完成。源自两个异构亚氨基-烯胺配体的和锆络合物各自产生非常高的分子量的乙烯/ 1-辛烯共聚物,然而,辛烯掺入量却存在显着差异。这些特征使得这些新型催化剂成为通过链穿梭聚合制备烯烃嵌段共聚物的良好候选者。