Zirconium and Titanium Propylene Polymerization Precatalysts Supported by a Fluxional <i>C</i><sub>2</sub>-Symmetric Bis(anilide)pyridine Ligand
作者:Ian A. Tonks、Daniel Tofan、Edward C. Weintrob、Theodor Agapie、John E. Bercaw
DOI:10.1021/om201262h
日期:2012.3.12
Titanium and zirconium complexes supported by a bis(anilide)pyridine ligand (NNN = pyridine-2,6-bis(N-mesitylanilide)) have been synthesized and crystallographically characterized. C2-symmetric bis(dimethylamide) complexes were generated from aminolysis of M(NMe2)4 with the neutral, diprotonated NNN ligand or by salt metathesis of the dipotassium salt of NNN with M(NMe2)2Cl2. In contrast to the case
由双(苯胺基)吡啶配体(NNN =吡啶-2,6-双(N-间苯二甲酰亚胺))负载的钛和锆配合物已经合成并在晶体学上进行了表征。C 2对称的双(二甲酰胺)配合物是由M(NMe 2)4与中性,双质子化的NNN配体进行氨解或通过NNN的二钾盐与M(NMe 2)2 Cl 2的盐复分解生成的。。与以前报道的吡啶双(酚盐)配合物相反,这些配合物的配体几何形状似乎是由螯合环应变而不是金属-配体π键决定的。五配位二卤化物配合物(NNN)MCl 2(M = Ti,Zr)的晶体结构显示C 1对称的几何形状,在金属和苯胺配体之间具有稳定的ipso相互作用。THF与(NNN)ZrCl 2的配位产生六配位的C 2对称配合物。已通过可变温度研究了可能通过平坦的C 2 v中间体对C 2配合物进行容易的对映体互变(NNN)MX 2(THF)n(M = Ti,Zr; X = NMe 2,Cl)和(NNN)Zr(CH 2 Ph)2的1