migration of silicon moiety and hydrogen atom, respectively. ansa-Zirconocenes, Me2Si(RInd)2ZrCl2 [R=2-p (3) and 3-p-tolyl (4)], have been prepared from the reactions of the corresponding dilithiated ligands with ZrCl4 in diethyl ether and hexane at −78°C. The molecular structure of rac-3 has been determined by a single crystal X-ray diffraction study. Propylene polymerization has been studied using rac-3
柄-Ligands中,Me 2的Si(果皮)2 [R = 2- p(1)和3- p -
甲苯基(2)],已制备的混合物外消旋-和内消旋-异构体以1:1的比率: 1分别来自Me 2 SiCl 2与1-对
甲苯亚甲基和2-对
甲苯亚甲基的
氰基
丙酸酯在
乙醚中的反应。通过部分重结晶1和2可分离出纯的外消旋异构体1r和2r。1的热非对映异构1 H-NMR光谱已经研究了外消旋和内消旋异构体之间的2和3。这些结果暗示1和2分别通过
硅部分和氢原子的迁移而经历非对映异构化过程。柄-Zirconocenes中,Me 2的Si(果皮)2的ZrCl 2 [R = 2- p(3)和3- p -
甲苯基(4)],已经从的反应制得的相应的配位体二
锂与的ZrCl 4在
乙醚和-78℃下的己烷。rac的分子结构- 3已经通过单晶X射线衍射研究确定。在甲基铝氧烷(MAO)存在下,使用rac - 3和meso - 4研究了
丙烯的聚合反应。催化剂rac