Synthesis and characterization of phosphorous-bridged bisphenoxy titanium complexes and their application to ethylene polymerization
作者:Hidenori Hanaoka、Yuka Imamoto、Takahiro Hino、Yoshiaki Oda
DOI:10.1016/j.jorganchem.2006.08.036
日期:2006.11
to the octahedral titanium (IV) center in a facial fashion and two chlorine atoms possess cis-geometry. Complexes 4a and 5a–5d were utilized as catalyst precursors for ethylene polymerization. Complex 5c gave high molecular weight polyethylene (Mw = 1,170,000, Mw/Mn = 2.0) upon activation with Al(iBu)3/[Ph3C][B(C6F5)4] (TB). Ethylene polymerization activity of 5d activated with Al(iBu)3/TB reached 49
合成了磷桥联双苯氧基钛配合物,并研究了它们的乙烯聚合行为。双[3-叔丁基-5-甲基-2-苯氧基](苯基)膦四氢呋喃二氯化钛(图4a是由治疗3当量的获得)ñ正丁基锂与二[3-叔丁基-2-羟基5-甲基苯基](苯基)膦盐酸盐(3a),然后是THF中的TiCl 4(THF)2。通过MOM保护的配体(2a - 2d)与TiCl 4的直接反应,可以更方便地合成不含THF的配合物5a - 5d。在甲苯中。对4a的X射线分析表明,该配体以面部方式与八面体钛(IV)中心键合,并且两个氯原子具有顺式几何形状。配合物4a和5a - 5d被用作乙烯聚合反应的催化剂前体。配合物5c 经Al(i Bu)3 / [Ph 3 C] [B(C 6 F 5)4活化后,得到高分子量聚乙烯(M w = 1,170,000,M w / M n = 2.0)。](TB)。Al(i Bu)3 / TB活化的5d的乙烯聚合活性达到49