Titanium–Imido Complexes with Pendant Groups – Synthesis, Characterization, and Evaluation of Their Role as Precatalysts for Ethylene Polymerization
作者:Viet‐Hoang Nguyen、Laure Vendier、Michel Etienne、Emmanuelle Despagnet‐Ayoub、Pierre‐Alain R. Breuil、Lionel Magna、David Proriol、Hélène Olivier‐Bourbigou、Christian Lorber
DOI:10.1002/ejic.201101005
日期:2012.1
coordinative arene, thienyl, furanyl, or pyridyl functionalities) was accomplished by a two‐ to five‐step synthesis in good yields. The ArPGNH2 proligands were used for the preparation of titanium complexes starting from Ti(NMe2)4 in the presence of excess Me3SiCl. Complexes of the general formula [Ti(NArPG)Cl2(NHMe2)x] (x = 1, 2), which are supported by a terminal imido functionality, were obtained
通过两步到五步合成以高收率完成在邻位被侧基取代的几个苯胺(Ar PG NH 2)的合成(PG,被潜在的配位芳烃,噻吩基,呋喃基或吡啶基官能团终止) 。在过量的Me 3 SiCl存在下,使用Ar PG NH 2配体从Ti(NMe 2)4开始制备钛配合物。通式[Ti(NAr PG)Cl 2(NHMe 2)x ](x= 1、2),这是由末端亚氨基官能团支持的,收率为60–95%。侧基的性质影响配体的配位方式。尽管在PG为芳烃,噻吩和呋喃的配体中仅观察到了单齿亚胺键,但具有取代吡啶侧臂的配体会导致螯合亚胺-供体官能团。通过可变温度1 H NMR光谱研究了某些亚氨基-供体配体的潜在半不稳定行为,该行为是由侧臂的可逆配位导致的。这些化合物被评估为与各种铝助催化剂进行乙烯聚合的预催化剂。获得了超高分子量(UHMW)聚乙烯。所有化合物均已通过分光光度法进行了充分表征(1H和13 C NMR)以及元素分析等