Group 4 metal complexes bearing new tridentate (NNO) ligands: Benzyl migration and formation of unusual C–C coupled products
作者:Renan Cariou、Vernon C. Gibson、Atanas K. Tomov、Andrew J.P. White
DOI:10.1016/j.jorganchem.2008.11.064
日期:2009.3
Group 4 metalcomplexes bearing new phenoxy(benzimidazolyl)-imine, -amine and -amide ligands have been synthesized. A series of metal chloride derivatives has been prepared via treatment of MCl4(THF)2 (M = Ti, Zr, Hf) with the in situ generated sodium salt of the (benzimidazolyl)imine phenol 1. Reaction of the pro-ligand 2 with TiCl4(THF)2 afforded the corresponding complex 8 in which the amine proton
已经合成了带有新的苯氧基(苯并咪唑基)-亚胺,-胺和-酰胺配体的第4族金属配合物。通过用原位生成的(苯并咪唑基)亚胺苯酚1的钠盐处理MCl 4(THF)2(M = Ti,Zr,Hf),制备了一系列金属氯化物衍生物。原配体2与TiCl 4(THF)2的反应得到相应的络合物8,其中胺质子仍与氮供体结合。通过用M(CH 2 Ph)处理原配体1和2合成锆和ha的苄基配合物4种前体。发现配合物[NNO] M(CH 2 Ph)3(6 M = Zr,7 M = Hf)经历了苄基从金属中心到配体主链亚胺碳的苄基迁移,从而形成了配合物11和12;迁移遵循一阶动力学。1与Ti(NMe 2)4的反应导致形成不寻常的C-C偶联产物,其中形成了新的哌嗪环。配合物11和12经历了相关的转变,从而导致了类似的C–C耦合产物,其特征在于X射线晶体学。进行氘标记实验以确定反应的机理。氯化物和苄基配合物3 - 12进行了筛选作为预催化剂用于烯烃聚合。