pseudoequatorial Ph group more stable by 5.6 kcal/mol. Kinetic studies on ketone insertion into these zirconocene complexes show second-order reactions, and the insertion is more favorable in the presence of a [Me2Si] ansa bridge, a less electron-rich substituent on the nitrogen, and a more basic ketone. One of the insertion products, namely Cp2Zr[N(Ph)CH═CHCH(Ph)CPh2O] (5a), has also been characterized
                                    锆茂茂-1-氮杂-1,3-二烯配合物,[Me 2 Si(C 5 H 4)2 ] Zr [N(Ar)CH = CHCH(Ph)](Ar = Ph,2a ; Ar = p -MeOC 6 ħ 4,图2b)1和CP 2 Zr的[N(Ar)的CH = CHCH(PH)](Ar为PH,3A ; Ar为p -MeOC 6 ħ 4,图3b),已经合成和表征通过NMR光谱。化合物2a和3a,b的X射线晶体结构测定揭示了
氧化锆环的折叠五元环部分。配合物2a的DFT计算和变温NMR实验在室温下建立了快速的环翻转过程,带有伪赤道Ph基团的构象更稳定了5.6 kcal / mol。酮插入这些
锆茂配合物中的动力学研究表明发生了二级反应,在[Me 2 Si] ansa桥,氮原子上电子较少的取代基和碱性较高的酮的存在下,插入更为有利。插入产物之一,即CP 2 Zr [N(Ph)CH = CHCH(Ph)CPh 2 O](5a),也已通过X射线晶体学表征。