Reactivity of Trimethylaluminum with Lanthanide Aryloxides: Adduct and Tetramethylaluminate Formation
作者:Andreas Fischbach、Eberhardt Herdtweck、Reiner Anwander、Georg Eickerling、Wolfgang Scherer
DOI:10.1021/om020784k
日期:2003.2.1
substituted lanthanide(III) and -(II) aryloxide complexes with trimethylaluminum (TMA) was investigated. The solvent-free, π-arene-bridged dimers [Ln(OAriPr,H)3]2, derived from the ortho-iPr2-substituted aryloxide ligand OC6H3iPr2-2,6, form bis-TMA adduct complexes, Ln(OAriPr,H)3(AlMe3)2, for the metal centers yttrium, samarium, and lanthanum. Homoleptic monomeric Ln(OAr)3, featuring a large La center
研究了各种高度取代的镧系元素(III)和-(II)芳氧基配合物与三甲基铝(TMA)的反应。无溶剂,π-芳烃桥联的二聚体[Ln(OAr i镨,H)3 ] 2,从邻衍生我PR 2 -取代的芳基氧化物配体OC 6 H ^ 3我PR 2 -2,6,形式双-加合物TMA络合物,LN(OAR我Pr,H)3(AlMe 3)2,用于金属中心钇,sa和镧。均配型单体LN(OAR)3,设有一个大的La中心和空间体积更大的邻吨卜2 -取代的芳基氧化物配体,得到单-加合物TMA的La(OAR吨Bu,R)3(AlMe 3)(R = H,Me)。这些加合物的杂桥部分“ Ln(μ-OAr)(μ-Me)Al”在溶液中是刚性的,而在室温下,桥接和末端甲基铝的交换在NMR时间尺度上是快速的。单体Ln(OAr t较小的稀土金属中心钇和的Bu,R)3(R = H,Me,t Bu)与TMA反应生成(Ar tBu,R O)2 Ln [(μ-Me)2