Efficient Solvent-Free Synthesis of Cyclic Carbonates from the Cycloaddition of Carbon Dioxide and Epoxides Catalyzed by New Imidazolinium Functionalized Metal Complexes Under 0.1 MPa
metal complexes were prepared as efficient and recyclable homogeneouscatalysts for the synthesis of cyclic carbonates via the coupling reaction of carbondioxide and epoxides in the absence of co-catalysts and solvent. Due to the synergistic effect between the metal center as Lewis acid and the imidazolinium groups with halide anions as Lewis base, these catalysts exhibited excellent catalytic capability
摘要 在无助催化剂和溶剂的情况下,通过二氧化碳和环氧化物的偶联反应制备了一系列咪唑啉官能化金属配合物作为高效且可回收的均相催化剂,用于合成环状碳酸酯。由于作为路易斯酸的金属中心与作为路易斯碱的卤化物阴离子的咪唑啉基团之间的协同作用,这些催化剂表现出优异的催化能力。特别是,双功能催化剂(分别为 2c、2i 和 2j)的高周转频率(TOF)值(1174、1240 和 1262 h -1 )是通过调整反应参数实现的。这些催化剂在常压下也表现出优异的催化性能。可回收性测试表明,这种双功能催化剂可以很容易地回收和重复使用至少五次,而不会显着降低活性和选择性。最佳反应条件也被筛选为(120°C,1.0 MPa CO 2 和2 h)。该催化剂还可应用于多种基材,并具有高催化活性,可长期使用。我们还进行了动力学研究,这表明催化剂的活性遵循 I - > Br - > Cl - 的顺序。此外,提出了咪唑啉官能化金属配合物的合理反应机制。图形摘要
Lignin modified by deep eutectic solvents as green, reusable, and bio-based catalysts for efficient chemical fixation of CO2
作者:Xingquan Xiong、Hui Zhang、Shi Lin Lai、Jinbin Gao、Lizhu Gao
DOI:10.1016/j.reactfunctpolym.2020.104502
日期:2020.4
renewable natural polymer on earth. In this study, deep eutectic solvents (DESs)-modified lignin heterogeneous catalysts were prepared for the first time via a facile acid-base interaction between choline chloride (ChCl) and p-aminobenzoic acid (PABA) or its derivatives, which were used to efficiently catalyze the cycloaddition of CO2 and terminal epoxidesunder green and mild conditions. Among them, lignin-ChCl-PABA
Rosin-based porous heterogeneous catalyst functionalized with hydroxyl groups and triazole groups for CO2 chemical conversion under atmospheric pressure condition
作者:Shilin Lai、Jinbin Gao、Xingquan Xiong
DOI:10.1016/j.reactfunctpolym.2021.104976
日期:2021.8
recyclable heterogeneous catalysts for the chemicalconversion of CO2 into cyclic carbonates with excellent yields under atmospheric pressure condition is still a very challenging task. Herein, a class of biomass-derived hyper-cross-linked porous heterogeneous catalysts MPAc-Br and MPAc-OH-Br, based on easily available and sustainable rosin, was synthesized by Friedel–Crafts polymerization and the further N-alkylation
开发高效、绿色和可回收的多相催化剂,用于在常压条件下将 CO 2化学转化为环状碳酸酯并具有优异的产率,仍然是一项非常具有挑战性的任务。在此,基于易得且可持续的松香,通过 Friedel-Crafts 聚合和三唑基团的进一步N-烷基化合成了一类生物质衍生的超交联多孔多相催化剂 MPAc-Br 和 MPAc-OH-Br。. 与MPAc-Br相比,双功能催化剂MPAc-OH-Br(带有三唑IL基团和-OH基团)对CO 2 的直接化学转化表现出更高的催化活性在无金属、无溶剂和大气压条件下转化为环状碳酸酯(产率高达 99%)。MPAc-OH-Br 表面的松香基多孔分子结构和双官能团在优化条件下促进 CO 2与环氧化物的环加成反应中发挥了非常重要的作用。此外,MPAc-OH-Br 表现出良好的稳定性和可重复使用性(10 次循环后产率为 96%)。
An aluminum porphyrin complex with high activity and selectivity for cyclic carbonate synthesis
作者:Yusheng Qin、Hongchen Guo、Xingfeng Sheng、Xianhong Wang、Fosong Wang
DOI:10.1039/c4gc02310b
日期:——
A carefully designed aluminum porphyrin complex with a quaternary ammonium salt cocatalyst exhibits high activity and selectivity for cyclic carbonates synthesis.
一种精心设计的铝卟啉配合物与季铵盐辅催化剂相结合,对环状碳酸酯合成具有高活性和选择性。
New lanthanide(<scp>iii</scp>) coordination polymers: synthesis, structural features, and catalytic activity in CO<sub>2</sub> fixation
作者:Cong Xu、Yan Liu、Li Wang、Jingxin Ma、Lizi Yang、Fu-Xin Pan、Alexander M. Kirillov、Weisheng Liu
DOI:10.1039/c7dt03574h
日期:——
A new series of lanthanide coordination polymers formulated as [Ln(μ-L)(μ3-L)(H2O)]nXn (Ln/X = Er/Cl (1), Er/Br (2), Tm/Cl (3), Tm/Br (4), Yb/Cl (5), and Yb/Br (6); L = 1,3-bis(4-carboxyphenyl) imidazolium carboxylate(1+)) were solvothermally generated and fully characterized. Single-crystal X-ray diffraction analysis shows that all products possess isomorphous structures that are composed of cationic