Isomerization in bent phosphametallocenes: Combining rotational barriers and the intramolecular slip-inversion-slip mechanism to control stereo-conformation
作者:William P. Freeman、Yi Joon Ahn、T. Keith Hollis、J. Andrew Whitaker、Victor C. Vargas、Ramel J. Rubio、Karen D. Alingog、Eike B. Bauer、Fook S. Tham
DOI:10.1016/j.jorganchem.2008.04.021
日期:2008.7
surface was found to be unsymmetrical with a maximum barrier of 8.8 kcal mol−1, which is about an order of magnitude greater than that reported for Cp2ZrCl2. The projection of the calculated rotational dynamics onto a 1-phosphatetrahydroindenyl system is illustrated. This model leads to an interpretation of the polymerization results and the rotational dynamics in phosphametallocenes.
四种新的磷腈并茂,[(4,5,6-三氢-1-磷戊烯基)2 ZrCl 2 ](8),[(4,5,6,7-四氢-1-膦吲哚基)2 ZrCl 2 ](9),制备[(4,5,6,7,8-五氢-1-磷腈基)2 ZrCl 2 ](10),(2,4-二甲基磷酰基)2 ZrCl 2(11)。[(4,5,6,7-四氢-1- phosphindolyl)的晶体结构2的ZrCl 2 ](9),获得的是揭示障碍(外消旋和内消旋异构体在同一个晶体中),并清楚地证明了其在弯曲的早期过渡金属磷酸金属茂中的内消旋构型。由于缺乏对磷金属茂中旋转动力学的光谱探测,因此选择丙烯聚合来提供立体选择性插入的记录,并通过推断洞悉磷金属茂的动力学来进行研究。Phosphazirconocenes 8 - 11进行了评价,并且外消旋/内消旋的混合物[(4,5,6,7-四氢-1- phosphindolyl)2的ZrCl 2 ](9)被发