Group 4 Metallocenes Bearing η<sup>5</sup>-2-(<i>N</i>-Azolyl)indenyl Ligands: Synthesis, Structure Characterization, and Olefin Polymerization Catalysis
作者:Artem Y. Lebedev、Vyatcheslav V. Izmer、Andrey F. Asachenko、Alexey A. Tzarev、Dmitry V. Uborsky、Yuliya A. Homutova、Elizar R. Shperber、Jo Ann M. Canich、Alexander Z. Voskoboynikov
DOI:10.1021/om8010257
日期:2009.3.23
obtaining several semisandwich complexes of zirconium, [η5-2-(N-azolyl)indenyl]zirconium tribromides, as well as symmetrical and unsymmetrical Waymouth-type zirconium and hafnium complexes containing indenyl ligands bearing planar N-azolyl or aryl fragments in position 2. These metallocenes were unambiguously characterized, including by X-ray crystal structure analysis, and a study of the fluxional behavior
易于获得的2-溴-1 H-茚与1 H-吡咯,1 H-吲哚,9 H-咔唑及其衍生物在Pd催化下的交叉偶联反应是获得含有唑的新型配体的便捷方法片段通过氮与环戊二烯基键合。使用1-茚满酮或2-茚满酮的烯醇三氟甲磺酸的另一方案也有用,特别是用于合成在位置1带有N-偶氮基片段的茚满。另一方面,合成2-(1H-苯并咪唑-1- yl)-1 H-茚只能通过Cu催化反应来获得。被N取代的取代基-azolyl片段在位置2被进一步用于获得锆的几个semisandwich络合物,[η 5 -2-(Ñ -azolyl)茚基]锆三溴化物,以及对称和不对称的Waymouth型锆和铪配合物含有茚基配体轴承位置2上存在一个平面的N-偶氮基或芳基片段。这些金属茂化合物的特征明确,包括X射线晶体结构分析,并且通过NMR光谱学研究了几种Waymouth型配合物在溶液中的通量行为。最后,发现新型的Waymouth型配合物在被MAO活化后,可形成乙烯均聚和乙烯/