Dynamic NMR spectroscopy of the MeB(C6F53− salts of a series of ring-substituted zirconium- and hafnium-containing metallocenium ions, exemplified by (RCp)2ZrCH3+, reveals two exchange processes. One, having the lower free energy of activation, involves shift of the CH3 group from one lateral equatorial orbital to the other. The second results from exchange between the metal-CH3 and B-CH3 groups. Effects
MEB的动态NMR光谱(C 6 ˚F 5 3 -一系列环取代的
锆和含
铪茂
金属离子,由(RCP)例举的盐2 ZrCH 3 +,其中说明了两个交换过程的一种,具有较低。活化的自由能涉及CH 3基团从一个赤道侧向轨道转移到另一侧,第二个结果来自
金属CH 3和B-CH 3基团之间的交换,并讨论了结构变化对交换壁垒的影响和相关性茂
金属离子催化的烯烃聚合。