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。
Tailoring ionic liquid catalysts: structure, acidity and catalytic activity of protonic ionic liquids based on anionic clusters, [(HSO<sub>4</sub>)(H<sub>2</sub>SO<sub>4</sub>)<sub>x</sub>]<sup>−</sup> (x = 0, 1, or 2)
作者:Karolina Matuszek、Anna Chrobok、Fergal Coleman、Kenneth R. Seddon、Małgorzata Swadźba-Kwaśny
DOI:10.1039/c4gc00415a
日期:——
The speciation of a family of inexpensive, easily prepared protonic ionic liquids, their physico-chemical properties and their performance as catalysts in the model esterification reaction have been correlated.
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 LIQUIDS FOR SOLUBILIZING POLYMERS
申请人:D'Andola Giovanni
公开号:US20100048829A1
公开(公告)日:2010-02-25
The present invention relates to a liquid composition which comprises at least one polymer and at least one ionic liquid, the cations of which are derived from polycyclic amidine bases, and a process for isolating cellulose from cellulose-containing sources using at least one such ionic liquid.
To provide a fluorine-containing elastomeric terpolymer which can be subjected to polyol vulcanization, has necessary and sufficient amine resistance while maintaining heat resistance, oil resistance and chemical resistance nearly equal to those of conventional fluorine-containing rubbers, and is suitable as an oil seal and hose for engine oil of car. The terpolymer contains 10 to 85 % by mole of ethylene unit, 14.9 to 50 % by mole of hexafluoropropylene unit and 0.1 to 45 % by mole of vinylidene fluoride unit.
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)-based ionic liquids (ILs) has exhibited a high catalytic activity in the aza-Michael reactions compared to conventional catalysts and with imidazole-based ILs. In the present work DBU-based ILs showed high catalytic potential for aza-Michael addition of aromatic amines to 2-cyclohexen-1-one under solvent-free condition. Electrospray ionization-mass spectrometry (ESI-MS) and density functional theory studies have been carried out to provide an effective activation mode of DBU-based ILs in aza-Michael addition. Our results show that both the presence of the acid hydrogen in the IL and the ability of the anion to carry out a hydrogen bond with the -NH2 group of the arylamine are fundamental for the reaction catalysis. The catalytic model proposed can be used for the rational development of new ILs with excellent catalytic properties.