水溶性的 salan 配体是通过对具有连接氮原子的各种桥接单元(接头)的 salens(N,N'-双(亚硅基)乙二胺和类似物)进行氢化和随后的磺化来合成的。Pd (II) 配合物是在硫柳胺和 [PdCl4]2- 的反应中获得的。配体和配合物的表征也包括广泛的 X 射线衍射研究。Pd (II) 配合物被证明是芳基卤化物和芳基硼酸衍生物在 80°C 下在水和空气中的 Suzuki-Miyaura 反应的高活性催化剂。对 Pd (II)-磺胺嘧啶催化剂的比较研究表明,催化活性随着接头长度的增加和配体 N 供体原子周围空间拥挤度的增加而大大增加;最高比活为40,000(mol底物)(mol催化剂×h)-1。
Pd-Tetrahydrosalan-Type Complexes as Catalysts for Sonogashira Couplings in Water: Efficient Greening of the Procedure
作者:Krisztina Voronova、Levente Homolya、Antal Udvardy、Attila C. Bényei、Ferenc Joó
DOI:10.1002/cssc.201402147
日期:2014.8
diphenylacetylenes can be isolated in 76–98 % yield. The aqueous catalyst solution can be recycled four times with decreasing activity; however, yields between 93 and 98 % can still be achieved with extended reaction times. Several water‐insoluble products can be isolated in excellent yield by simple filtration and purification by washing with water; this method is used, for the first time, for this type
合成了新的磺化四氢salen型配体及其水溶性钯(II)配合物。钯(II)配合物催化各种芳基卤化物(包括氯代芳烃)与末端炔烃的Sonogashira偶联(23个实例),在温和条件下(80°C,空气,无Cu I助催化剂)在有机水溶液中具有良好至优异的转化率混合物和周转频率高达2790 h -1。在优化的反应条件下,以最小化环境污染,可以分离出76.98%的二苯乙炔。催化剂水溶液可以降低活性地循环使用四次。但是,延长反应时间仍可实现93%至98%的收率。通过简单的过滤和水洗纯化,可以分离出几种不溶于水的产物,收率很高。这种方法首次用于这种CC耦合过程。
Synthesis, structure and catalytic alcohol oxidation by ruthenium(III) supported by Schiff base and triphenylphosphine ligands
hydrogen peroxide in the presence and absence of ethylmethyl imidazolium chloride (EMIM) ionic liquid as solvent. The immobilized complexes proved to be effective catalysts and generally exhibited much higher catalytic performance than their homogeneous analogue. Catalytic performance of the complexes was also found to be closely related to the Schiff base ligands used. Additionally, ion liquid solvent
Solvent-free oxidation of alcohols by hydrogen peroxide over chromium Schiff base complexes immobilized on MCM-41
作者:Xiaoli Wang、Gongde Wu、Wei Wei、Yuhan Sun
DOI:10.1007/s11243-009-9316-7
日期:2010.3
A series of chromium(III) Schiff base complexes immobilized on MCM-41 were prepared and characterized by various physicochemical and spectroscopic methods. The complexes were used for the selective oxidation of alcohols by 30% hydrogen peroxide without any organic solvent, phase transfer catalyst or additive. The immobilized complexes proved to be effective catalysts and generally exhibited much higher catalytic performance than their corresponding homogeneous analogs. The catalytic performance of the immobilized complexes was also found to be closely related to the Schiff base ligands used. Under the optimal reaction conditions, secondary alcohols, cyclic alcohols and benzyl alcohol were prevailingly oxidized to their corresponding ketones or aldehydes.
An efficient and weak efficiency-roll-off near-infrared (NIR) polymer light-emitting diode (PLED) based on a PVK-supported Zn<sup>2+</sup>–Yb<sup>3+</sup>-containing metallopolymer
Based on the Zn2+–Yb3+-containing metallopolymer Poly(NVK-co-3) (75 : 1), PLEDs I–II with or without TPBI exhibit a record-renewed performance (80.14–85.63 μW cm−2, 0.05–0.058%, and weaker efficiency-roll-off) relative to Yb3+-doped PLEDs.