A CO<sub>2</sub>-mediated base catalysis approach for the hydration of triple bonds in ionic liquids
作者:Minhao Tang、Fengtao Zhang、Yanfei Zhao、Yuepeng Wang、Zhengang Ke、Ruipeng Li、Wei Zeng、Buxing Han、Zhimin Liu
DOI:10.1039/d1gc03865f
日期:——
approach for the activation of triplebonds in ionic liquids (ILs) with anions that can chemically capture CO2 (e.g., azolate, phenolate, and acetate), which can achieve hydration of triplebonds to carbonyl chemicals. It is discovered that the anion-complexed CO2 could abstract one proton from proton resources (e.g., IL cation) and transfer it to the CN or CC bondsvia a six-membered ring transition
在此,我们报告了一种 CO 2介导的碱催化方法,用于激活离子液体 (IL) 中的三键,其中的阴离子可以化学捕获 CO 2(例如,唑盐、酚盐和乙酸盐),从而实现三键的水合羰基化学品。发现阴离子络合的CO 2可以从质子资源(例如IL阳离子)中提取一个质子,并通过六元环过渡态将其转移到C N 或C C 键,从而实现它们的水合。特别是,四丁基鏻 2-羟基吡啶在 CO 2下对腈和含C C 键的化合物的水合显示出高效率气氛,以优异的收率提供一系列羰基化合物。这种催化方案简单、绿色、高效,开辟了一种在温和和无金属条件下通过三键水合获得羰基化合物的新方法。
Thermodynamic favorable CO2 conversion via vicinal diols and propargylic alcohols: A metal-free catalytic method
作者:Li-Hua Han、Jing-Yuan Li、Qing-Wen Song、Kan Zhang、Qian-Xia Zhang、Xiao-Fang Sun、Ping Liu
DOI:10.1016/j.cclet.2019.06.030
日期:2020.2
promising field in chemical fixation of CO2. Herein, a facile metal-free strategy was reported for the one-pot preparation of cyclic carbonates and α-hydroxy ketones from vicinaldiols, propargylic alcohols and CO2. Wide scope of vicinaldiols and propargylic alcohols was demonstrated to be efficient under the DBU-catalyzed conditions. A plausible mechanism was proposed, which included detailed main and side
An efficient and recyclable AgNO3/ionic liquid system catalyzed atmospheric CO2 utilization: Simultaneous synthesis of 2-oxazolidinones and α-hydroxyl ketones
AgNO3/ionic liquid (IL) catalytic system was developed for the simultaneous synthesis of these compounds through the atom-economical three-component reactions of propargyl alcohols, 2-aminoethanols, and CO2. Notably, this system behaved excellent catalytic activity with the lowermost metal loading of 0.25 mol%. Meanwhile, it is the first reported metal-catalyzed system that could efficiently work under
The reaction of carbon dioxide with α-ethynyl tertiary alcohols has been catalyzed by cobaltocene to give α-methylene cyclic carbonates in good yields. α-Ethynyl primary or secondary alcohols give noncyclic alkyl carbonates in fair yields.