Exploration of the Suitability of Bicyclic Guanidinates as Ligands in Catalytic Chemistry Mediated by Titanium
作者:Martyn P. Coles、Peter B. Hitchcock
DOI:10.1021/om0341092
日期:2003.12.1
The synthesis, structure, and reactivity of titanium complexes supported by the bicyclic guanidinate ligand derived from 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) are described. In situ reaction between a THF solution of the lithium salt, (hppLi)n, and titanium chloride starting materials afforded the series of compounds Ti(hpp)nCl4-n(THF)x [n = 1, x = 1 (1); n = 2, x = 0 (3); n = 3
描述了由1,3,4,6,7,8-六氢-2 H-嘧啶[1,2- a ]嘧啶(hppH)衍生的双环胍盐配体负载的钛配合物的合成,结构和反应活性。锂盐(hppLi)n的THF溶液与氯化钛原料之间的原位反应提供了一系列化合物Ti(hpp)n Cl 4 - n(THF)x [ n = 1,x = 1(1); n = 2,x = 0(3);n = 3,x = 0(4)]。由甲硅烷化的配体前体hppSiMe 3与TiCl 4在CH 2 Cl 2中反应合成了二聚体,无碱的复合物[Ti(hpp)Cl 2(μ-Cl)] 2(2)。的初步烯烃聚合的研究1 - 3使用MAO作为活化剂表示低活动。AlMe 3的3至2当量之间的反应导致形成新型三金属Ti(III)物种Ti AlMe 2(hpp)2 } Cl(μ-Cl)AlMe 3(5),突出了配体的非无害行为。通过中性配体前体,hppH和Ti(CH 2 Ph)4之