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。
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。
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
METHODS OF RING OPENING POLYMERIZATION AND CATALYSTS THEREFOR
申请人:Coady Daniel Joseph
公开号:US20120046437A1
公开(公告)日:2012-02-23
A salt catalyst comprises an ionic complex of i) a nitrogen base comprising one or more guanidine and/or amidine functional groups, and ii) an oxoacid comprising one or more active acid groups, the active acid groups independently comprising a carbonyl group (C═O), sulfoxide group (S═O), and/or a phosphonyl group (P═O) bonded to one or more active hydroxy groups; wherein a ratio of moles of the active hydroxy groups to moles of the guanidine and/or amidine functional groups is greater than 0 and less than 2.0. The salt catalysts are capable of catalyzing ring opening polymerization of cyclic carbonyl compounds.
METHODS OF DEPOLYMERIZING TEREPHTHALATE POLYESTERS
申请人:Alabdulrahman Abdullah M.
公开号:US20120223270A1
公开(公告)日:2012-09-06
A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.
Repurposing cycloaddition of β-carbonyl phosphonate and azide to synthesize triazolyl phosphonates <i>via</i> ionic-liquid-based data-driven screening
作者:Anlian Zhu、Dongshuang Fan、Yanbo You、Honglei Wang、Yang Zhao、Jianji Wang、Lingjun Li
DOI:10.1039/d2gc02461f
日期:——
liquids for discovering new reactivity, developing potent synthetic reactions, and even simplifying bioactivity evaluations. Using ILDDS, we repurposed the cycloaddition of β-carbonyl phosphonate and azide to synthesize triazolyl phosphonates that usually produced phosphonate-leaving products under the traditional conditions. And then, the repurposed cycloaddition reaction allows the access of triazolyl