Neutral and Cationic N-Heterocyclic Carbene Zirconium and Hafnium Benzyl Complexes: Highly Regioselective Oligomerization of 1-Hexene with a Preference for Trimer Formation
作者:Samuel Dagorne、Stéphane Bellemin-Laponnaz、Charles Romain
DOI:10.1021/om400182d
日期:2013.5.13
Various zirconium and hafnium amido, chloro, and benzyl complexes supported by a tridentate N-heterocyclic carbene bis-phenolate dianionic ligand ((OCO)2–) have been synthesized and structurally characterized. The alcohol elimination reaction of the protio ligand N,N′-bis(2-hydroxy-3,5-di-tert-butylphenyl)-4,5-dihydroimidazolium chloride (1) and the metal alkoxide precursors M(OiPr)4(HOiPr) (M = Zr
由三齿N-杂环卡宾双酚盐双阴离子配体((OCO)2–)支撑的各种锆和ha酰胺基,氯和苄基络合物已被合成并进行了结构表征。蛋白质配体N,N'-双(2-羟基-3,5-二叔丁基苯基)-4,5-二氢咪唑氯化物(1)和金属醇盐前体M(O i Pr)的醇消除反应4(HO i Pr)(M = Zr,Hf)和随后的醇盐/氯化物交换反应(添加三甲基甲硅烷基氯,TMSCl)得到相应的Zr和Hf卡宾二氯配合物,为THF加成物:(OCO)MCl 2(THF )(2a-THF,M = Zr; m = 2。2b-THF,M = Hf)。如通过单晶X射线晶体学研究所确定的,Hf衍生物2b-THF的分子结构证实了所提出的制剂和(OCO)Hf螯合物的有效形成。在Zr的情况下,携带时,原配体1和Zr(NMe 2)4之间的胺消除反应产生相应的Zr酰胺THF加合物(OCO)Zr(NMe 2)(Cl)(THF)(3a-THF)以THF为溶剂,使用CH