Metal‐Free Cycloaddition of Epoxides and Carbon Dioxide Catalyzed by Triazole‐Bridged Bisphenol
作者:Yanhong Hao、Dan Yuan、Yingming Yao
DOI:10.1002/cctc.202000508
日期:2020.9.4
1,2,3‐triazole‐bridged bisphenol has been developed as organocatalyst in the coupling of CO2 and epoxides. In the absence of halide co‐catalyst, halomethyl‐substituted epoxides reacted with 1 bar CO2, while a series of aryl‐substituted epoxides were transformed into cyclic carbonates in 57–95 % yields at 120 °C and 10 bar pressure. 1,2,3‐triazole‐bridged bisphenol is thus among the most efficient organocatalysts
1,2,3-三唑桥连双酚已被开发为在CO 2和环氧化物偶联中的有机催化剂。在没有卤化物助催化剂的情况下,卤甲基取代的环氧化物与1 bar CO 2反应,而一系列芳基取代的环氧化物在120°C和10 bar压力下以57–95%的产率转化为环状碳酸酯。因此,1,2,3-三唑桥连的双酚是最有效的有机催化剂,在没有金属和卤化物的情况下具有活性。对于烷基取代的环氧化物,在1 bar CO 2下获得良好的收率80-95%在卤化物的存在下。在存在卤化物的情况下,双酚被循环14次,在不存在卤化物的情况下被循环5次。提出双酚的两个羟基在催化循环中协同作用。
Metal-free imidazolium hydrogen carbonate ionic liquids as bifunctional catalysts for the one-pot synthesis of cyclic carbonates from olefins and CO<sub>2</sub>
A direct route for the synthesis of cyclic carbonates from olefins and CO2 has been achieved by using imidazolium hydrogen carbonate ionicliquids ([CnCmIm][HCO3]) as bifunctional catalysts in the absence of a solvent. [CnCmIm][HCO3] can convert into a carbene–CO2 adduct spontaneously. The HCO3− anion and carbene–CO2 can serve as catalysts for olefin epoxidation and CO2 cycloaddition, respectively
通过在不存在溶剂的情况下使用咪唑鎓碳酸氢盐离子液体([C n C m Im] [HCO 3 ])作为双官能催化剂,已经实现了由烯烃和CO 2合成环状碳酸酯的直接途径。[C n C m Im] [HCO 3 ]可自发转化为卡宾-CO 2加合物。的HCO 3 -阴离子和卡宾-CO 2可以用作催化剂的烯烃环氧化和CO 2环加成,分别明显简化了环状碳酸酯的合成。在温和条件下,反应进行得很好。这种廉价而简单的方法可以以良好或优异的环状碳酸酯收率应用于各种烯烃。该催化剂可以容易地循环至少四次,而不会明显丧失其催化活性。
Palladium–salen-bridged ionic networks immobilized on magnetic dendritic silica fibers for the synthesis of cyclic carbonates by oxidative carboxylation
We studied the potential application of an efficient, reusable, and easily recoverable catalyst of dendritic fibrous nanosilica (DFNS)-supported platinum(II) complexes (DFNS/Pt(II) NPs) to form cycliccarbonates in the presence of epoxides by converting carbondioxide. Cycliccarbonates from epoxides and carbondioxide is proposed as the most appropriate way to synthesis this C1 building block. We
我们研究了一种高效、可重复使用且易于回收的树枝状纤维状纳米二氧化硅 (DFNS) 负载的铂 ( II ) 配合物 (DFNS/Pt( II ) NPs) 催化剂在环氧化物存在下通过转化碳形成环状碳酸酯的潜在应用。二氧化碳。来自环氧化物和二氧化碳的环状碳酸酯被认为是合成这种 C1 结构单元的最合适的方法。我们进行了 FE-SEM、TEM、TGA、BET、VSM 和 ICP-MS 以彻底表征 DFNS/Pt( II ) NPs。
Ionic Liquid Supported on DFNS Nanoparticles Catalyst in Synthesis of Cyclic Carbonates by Oxidative Carboxylation
作者:Mengbing Cui、Farzaneh Shamsa
DOI:10.1007/s10562-021-03616-6
日期:2022.1
In this paper, in the proximity of epoxides, we have suggested the conversion of carbondioxide (CO2) for cyclic carbonates known as the most proper approach for synthesizing this C1 building block. Oxidation carboxylation of styrenes with CO2 is performed at aerobic conditions utilizing the present approach. Oxidize carboxylation of styrenes by CO2 was performed in the presence of DFNS-IL as NPs.
在本文中,在环氧化物附近,我们建议将二氧化碳 (CO2) 转化为环状碳酸酯,这是合成这种 C1 结构单元的最合适方法。利用本方法在需氧条件下用 CO2 对苯乙烯进行氧化羧化。在作为 NPs 的 DFNS-IL 存在下,通过 CO2 对苯乙烯进行氧化羧化。提供了使用 DFNS-IL 纳米催化剂的性能优良到卓越的产品。此外,DFNS-IL 的解剖结构已通过各种方法进行区分,包括 XRD、VSM、FT-IR、SEM、EDX、TEM 和 TGA。过量添加DFNS后催化体系的稳定性增加。此外,热过滤测试提供了对催化剂异质性的全面了解。反复研究了催化剂的再利用和循环用于偶联反应。此外,还对偶联反应的机理进行了深入研究。DFNS纳米颗粒催化剂负载离子液体在氧化羧化合成环状碳酸酯中的应用