Aperture-Opening Encapsulation of a Transition Metal Catalyst in a Metal–Organic Framework for CO<sub>2</sub> Hydrogenation
作者:Zhehui Li、Thomas M. Rayder、Lianshun Luo、Jeffery A. Byers、Chia-Kuang Tsung
DOI:10.1021/jacs.8b04047
日期:2018.7.5
resulting from dissociative linker exchange in zirconium-based metal-organic framework (MOF) UiO-66 was used to encapsulate the ruthenium complex (tBuPNP)Ru(CO)HCl in the framework (tBuPNP = 2,6-bis((di- tert-butyl-phosphino)methyl)pyridine). The resulting encapsulated complex, [Ru]@UiO-66, was a very active catalyst for the hydrogenation of CO2 to formate. Unlike the analogous homogeneous catalyst, [Ru]@UiO-66
Control of Catalyst Isomers Using an <i>N</i>-Phenyl-Substituted RN(CH<sub>2</sub>CH<sub>2</sub>P<sup>i</sup>Pr<sub>2</sub>)<sub>2</sub> Pincer Ligand in CO<sub>2</sub> Hydrogenation and Formic Acid Dehydrogenation
作者:Julia B. Curley、Clayton Hert、Wesley H. Bernskoetter、Nilay Hazari、Brandon Q. Mercado
DOI:10.1021/acs.inorgchem.1c03372
日期:2022.1.10
[CH3N(CH2CH2PiPr2)2] illustrate that there are large changes in the coordinationchemistry that occur when the nitrogen substituent of the pincer ligand is altered. For example, ruthenium hydrides supported by the iPrPNPhP ligand always form the syn isomer (where syn/anti refer to the relative orientation of the group on nitrogen and the hydride ligand on ruthenium), whereas complexes supported by iPrPNHP
一种新型钳形配体iPr PN Ph P [PhN(CH 2 CH 2 P i Pr 2 ) 2 ],它是多功能 MACHO 配体iPr PN H P [HN(CH 2 CH 2 P i Pr 2 )的类似物2 ],合成和表征。该配体与钌配位,分离出一系列含氢化物的配合物,并通过 NMR 和 IR 光谱以及 X 射线衍射对其进行了表征。与以前发表的iPr PN H P 和iPr连接的类似物的比较PN Me P [CH 3 N(CH 2 CH 2 P i Pr 2 ) 2 ]说明当钳形配体的氮取代基发生改变时,配位化学发生很大变化。例如,由iPr PN Ph P 配体支持的氢化钌总是形成顺式异构体(其中顺/反是指氮上的基团和钌上的氢化物配体的相对方向),而由iPr PN H P支持的络合物形成iPr PN Me支持的反异构体和配合物P 形成顺式和反式异构体的混合物。我们通过比较一系列iPr PN
1,3-Dimethylimidazolium-2-carboxylate: a zwitterionic salt for the efficient synthesis of vicinal diols from cyclic carbonates
topic in green chemistry. Herein, a series of basic ionicliquids (ILs) were investigated as catalysts for the synthesis of vicinal diols via the hydrolysis of cyclic carbonates in order to improve this kind of synthetic process. The effects of the IL structure, the molar ratio of cyclic carbonate to water, and various reaction parameters on the catalytic performance were investigated in detail. It was
在温和的反应条件下开发用于反应的高效,廉价和可循环使用的催化剂是绿色化学中非常有吸引力的主题。在本文中,研究了一系列碱性离子液体(ILs)作为通过环状碳酸酯水解合成邻位二醇的催化剂,以改善这种合成方法。详细研究了IL结构,环状碳酸酯与水的摩尔比以及各种反应参数对催化性能的影响。发现一种简单的无卤两性离子催化剂1,3-二甲基咪唑-2-羧酸盐具有很高的活性(时空产率为1086 h -1),并具有优异的选择性,可用于制备乙二醇。碳酸亚乙酯的水解。该催化剂可以重复使用六次而不会明显降低催化活性。同样,它适用于多种环状碳酸酯,以高产率和高选择性生产它们相应的邻位二醇。根据实验结果,核磁共振光谱和理论计算,提出了一种可能的催化循环方法。该反应方案为化学合成替代传统的碱性或碱性ILs开辟了新的可能性。
Ionic liquid [OMIm][OAc] directly inducing oxidation cleavage of the β-O-4 bond of lignin model compounds
作者:Yingying Yang、Honglei Fan、Qinglei Meng、Zhaofu Zhang、Guanying Yang、Buxing Han
DOI:10.1039/c7cc04209d
日期:——
We explored the oxidation reactions of lignin model compounds directly induced by ionicliquids under metal-free condi-tions. In this work, it was found that ionicliquid 1-octyl-3-methylimidazolium acetate as a solvent could promote the aero-bic oxidation of lignin model compounds 2-phenoxyacetophenone (1) and the yields of phenol and benzoic acid from 1 could be as high as 96% and 86%, respectively
An integrated high-throughput strategy enables the discovery of multifunctional ionic liquids for sustainable chemical processes
作者:Anlian Zhu、Lingjun Li、Chi Zhang、Yutan Shen、Mingjie Tang、Lili Bai、Chunyan Du、Suojiang Zhang、Jianji Wang
DOI:10.1039/c8gc03119c
日期:——
high-throughput preparation of ionicliquids and in situ screening of their reaction-promoting performance in 96-well plates. The integrated approach then enables a facile identification of optimal ionicliquidsfrom a 400-ionic liquid candidate pool to act as the solvent, the catalyst and the separating assistant, simultaneously, for carbonyl-azide cycloaddition reactions. Merits of the ionic liquids-based processes