New Titanatranes: Characterization and Styrene Polymerization Behavior
作者:Youngjo Kim、Yonggyu Han、Jeong-Wook Hwang、Myong Woon Kim、Youngkyu Do
DOI:10.1021/om0109197
日期:2002.3.1
they exist in the monomeric form in the solid state and the Ti atom adopts essentially an η5 bonding posture with the Cp‘ ring and a tetradentate bonding mode with the trialkanolatoamine ligand via a transannular interaction from the bridgehead N atom to Ti. All compounds show very high catalytic activity for the syndiospecificpolymerization of styrene in the presence of modified methylaluminoxane
在三乙胺的存在下,通过各种三烷醇胺与(C 5 Me 4 R)TiCl 3(CP'= C 5 Me 4 R)的反应,制备了含有环戊二烯基配体的新的钛烷烃。X射线分析表明,它们在单体形式存在于固态和钛原子基本上采用一个η 5与CP”环接合姿势并与来自含有桥头氮的trialkanolatoamine配体经由一个跨环相互作用四齿键合方式钛原子。在改性甲基铝氧烷(MMAO)助催化剂的存在下,所有化合物均表现出很高的催化苯乙烯间间聚合反应的催化活性。
Enantiomeric programming in tripodal transition metal scaffolds
作者:Nicholas C. Fletcher、Ciarán Martin、Heather J. Abraham
DOI:10.1039/b703761a
日期:——
A new route to the isolation of the enantiopure tris-chelate complex (Δ/Λ)-fac-[Ru(L1)3]2+
(where L1 is 2,2′-bipyridine-5-carboxylic acid) is demonstrated, where the transition metal centre retains the memory of the chirality present in a simple tripodal tether used to control the metal centred geometry.