Reaction of 2,8-Bis(<i>o</i>-hydroxyaryl)quinolines with Group 4 Metal Alkyls Resulting in Three Distinct Coordination Modes of the Tridentate Ligand. X-ray Structure of Complexes and Performance as Precursors in Ethylene Polymerization Catalysis
作者:Ilya E. Nifant’ev、Pavel V. Ivchenko、Vladimir V. Bagrov、Sandor M. Nagy、Shahram Mihan、Linda N. Winslow、Andrei V. Churakov
DOI:10.1021/om4001555
日期:2013.5.13
of these new ligand precursors with group 4 tetrabenzyl complexes MBn4 results in benzyl substitution of the azine fragment with the formation of amide complexes (M = Ti) or amine complexes with an N–H fragment coordinated to the metal (M = Zr, Hf). The third structural type—Zr complexes where the aromatic system of the precursor remains intact—can be prepared through the reaction of the bis(o-hydroxyphenyl)quinolones
从2,8-二溴喹啉开始,制备了一系列双(邻-羟基苯基)喹啉。这些新的配体前体与第4组四苄基配合物MBn 4的反应导致嗪片段被苄基取代,形成酰胺配合物(M = Ti)或胺配合物,NH片段与金属配位(M = Zr, Hf)。可以通过使双(邻-羟基苯基)喹诺酮与4摩尔甲基锂反应,然后通过ZrCl 4制备第三种结构类型-Zr络合物,其中前体的芳族体系保持完整。。当用二氧化硅载体上的MAO /硼酸酯助催化剂活化时,新的配合物可形成活性聚合催化剂,从而产生具有非常高分子量和多峰MWD的聚乙烯共聚物。