作者:Andrew L. McKnight、Md. Athar Masood、Robert M. Waymouth、Daniel A. Straus
DOI:10.1021/om9609628
日期:1997.6.1
yields (5−50%). Two optically active examples based on (S)-(−)-(α)-methylbenzylamine are presented, and the molecular structure of (+)-(R)-[η5: η1-(Ind)SiMe2-(S)-NCHMePh]TiCl2 (4) has been determined by X-ray crystallography. These complexes are active in the presence of methylaluminoxane for propylene polymerization and yield high molecular weight atactic polymers with slight syndiotactic enrichment
单-Cp酰氨基配合物[η 5:η 1 -Cp'SiMe 2(NR)]的MC1 2(M =的Ti,Zr)的已通过复分解和消除胺航线低被合成到中等收率(5-50%) 。基于(两个光学活性的例子小号) - ( - ) - (α) -甲基苄基等,并针对的分子结构(+) - ([R )- [η 5:η 1 - (茚基)森达2 - (S )-NCHMePh] TiCl 2(4)已通过X射线晶体学测定。这些络合物在甲基铝氧烷的存在下对丙烯聚合具有活性,并生成高分子量无规立构聚合物,间规富集程度很小。生产率,分子量和立构规程取决于Cp'和NR。将手性胺结合到配体骨架中对立体特异性几乎没有影响。衍生自钛催化剂的聚丙烯显示出大量的2,1-单体插入(2-5%)。