由1,4-双(2-羟基-3,5-二叔丁基-苄基)咪唑烷H 2 [O 2 N 2] BuBuIm(L1H 2)与正丁基锂反应制得新型锂配合物提供相应的四锂胺-双(酚盐)配合物{Li 2 [L1]} 2·4THF,1。可变温度7 Li NMR显示该络合物在溶液中不稳定,在高温下会解离,得到两个双锂实体。此外,对1进行了7 Li MAS NMR,以提供有关块状固态锂配位环境的信息。在ε-己内酯(e-CL)的扩环聚合中评估了1的反应性,这是在e-CL中的一级反应,其活化能为50.9 kJmol -1。1与相关的Li配合物(原位形成)与BiCl 3反应,得到了水解不稳定的酚酸铋。
Reprint of Structural characterization of a tetrametallic diamine-bis(phenolate) complex of lithium and synthesis of a related bismuth complex
作者:Marcus W. Drover、Jennifer N. Murphy、Jenna C. Flogeras、Céline M. Schneider、Louise N. Dawe、Francesca M. Kerton
DOI:10.1016/j.poly.2016.03.049
日期:2016.3
e-caprolactone (e-CL), which was first order in e-CL with an activation energy of 50.9 kJmol−1. Reaction of 1 and a related Li complex (formed in situ) with BiCl3 afforded hydrolytically unstable bismuth phenolate species, as evidenced by the isolation and structuralcharacterization of [Bi4(Cl)3(μ-Cl)(μ-O)(O)2[O2N2]BuBuPip}2], 2, where [O2N2]BuBuPip is the homopiperazine-containing analog of L1.
摘要由1,4-双(2-羟基-3,5-二叔丁基-苄基)咪唑烷H2 [O2N2] BuBuIm(L1H2)与正丁基锂反应制得新型锂配合物四锂胺-双(酚盐)配合物Li2 [L1]} 2·4THF,1。可变温度7Li NMR表明,该配合物在溶液中不稳定,在高温下会解离,得到两个双锂实体。此外,对1进行了7Li MAS NMR,以提供有关块状固态锂配位环境的信息。在ε-己内酯(e-CL)的扩环聚合反应中评估了1的反应性,这是e-CL中的一级反应,活化能为50.9 kJmol-1。1与相关的Li配合物(原位形成)与BiCl3反应,得到了水解不稳定的酚酸铋。
Synthesis and characterization of rare-earth metal guanidinates stabilized by amine-bridged bis(phenolate) ligands and their application in the controlled polymerization of rac-lactide and rac-β-butyrolactone
Eight rare-earth metal guanidinates supported by a versatile family of bridged bis(phenolate) ligands were synthesized, and their application in initiating stereoselective ROP of rac-lactide and rac-β-butyrolactone were investigated and compared.
Structural characterization of dinuclear Ti(IV) complexes of rigid tetradentate dianionic diamine bis(phenolato) ligands; effect of steric bulk on coordination features
作者:Cesar M. Manna、Michal Shavit、Edit Y. Tshuva
DOI:10.1016/j.jorganchem.2008.09.056
日期:2008.12
difference in diaminebis(phenolato) ligands, namely an additional single methylene unit, directs formation of dinuclear Ti(IV) complexes rather than mononuclear ones as characterized by X-ray crystallography. Varying steric bulk of the ligand affects the coordination number in the dinuclear complexes and the ligand to metal ratio. A ligand with reduced steric bulk leads to a L2Ti2(OiPr)4 type complex featuring
Synthesis of Rare-Earth Metal Amides Bearing an Imidazolidine-Bridged Bis(phenolato) Ligand and Their Application in the Polymerization of <scp>l</scp>-Lactide
作者:Zhongjian Zhang、Xiaoping Xu、Wenyi Li、Yingming Yao、Yong Zhang、Qi Shen、Yunjie Luo
DOI:10.1021/ic802177y
日期:2009.7.6
yields. All of these complexes are fully characterized. X-ray structural determination revealed that complexes 1−6 are isostructural and have a solvated monomeric structure. The coordination geometry around each of the rare-earth metal atoms can be best described as a distorted trigonal bipyramid. It was found that complexes 1−6 are efficient initiators for the ring-openingpolymerization of l-lactide, and
A highly active and stable imidazolidine-bridged N,O-donor ligand for efficient palladium catalyzed Suzuki–Miyaura reactions in water
作者:Jun Xue、Zhonggao Zhou、Yulan Liu、Li Huang、Hongwei Yu、Yongrong Xie、Chen Lai
DOI:10.1007/s11243-012-9593-4
日期:2012.5
of activity.Graphical AbstractThe stericallyhindered imidazolidine-bridged mixed nitrogen, oxygen ligand 1 was efficient for Pd-catalyzed Suzuki reactions involving aryl iodides, aryl bromides and activated aryl chlorides with arylboronic acid in aqueous methanol with K2CO3 as a base the high catalytic activity and oxygen or moisture stable of palladium complexes maybe distribute to the bulky tert-butyl