Cyclic organic carbonates were prepared from epoxides (derivatives of C-3-C-16 olefins, C-4 and C-8 dienes, styrene; epichlorohydrin) in the presence of a catalytic system consisting of CoCl2 . 6H(2)O and dimethylformamide.
Carbon dioxide (CO2) is a nontoxic and inexpensive C1 building block, which can be used for the synthesis of valuable chemicals such as aromatic carbamatesfromanilines and methanol (MeOH), glycerol carbonate from glycerol, and cyclic carbonates from diols. However, these reactions generate water as the byproduct and suffer from thermodynamic limits, which lead to low yields. Calcium carbide (CaC2)
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
Highly regio- and stereoselective synthesis of cyclic carbonates from biomass-derived polyols<i>via</i>organocatalytic cascade reaction
作者:Hui Zhou、Hui Zhang、Sen Mu、Wen-Zhen Zhang、Wei-Min Ren、Xiao-Bing Lu
DOI:10.1039/c9gc03013a
日期:——
The cascade reaction of CO2, vicinal diols, and propargylicalcohol, was firstly achieved by dual Lewis base (LB) organocatalytic systems involving LB–CO2 adducts and commercially available organic amines. This methodology could overcome the chemical inertness of CO2, providing an alternative route to various functionalized five-membered cyclic carbonates in moderate to high yields under mild reaction
CO 2,邻二醇和炔丙醇的级联反应首先通过双路易斯碱(LB)有机催化体系实现,该体系涉及LB–CO 2加合物和可商购的有机胺。该方法可以克服CO 2的化学惰性,在温和的反应条件下(25°C,1.0 atm CO 2)以中等至高收率提供各种功能化的五元环状碳酸酯的替代路线)。更重要的是,该方法还可以用于由生物质衍生的多元醇轻松有效地合成手性多环碳酸酯,并完全保留手性中心的构型。这项研究为构建具有多功能基团和手性中心的增值环状碳酸酯提供了一种环境友好,可扩展且具有成本效益的方案。
Biomass-derived Cu/porous carbon for the electrocatalytic synthesis of cyclic carbonates from CO<sub>2</sub> and diols under mild conditions
作者:Jing-Jie Zhang、Shi-Ming Li、Yi Shi、Qiao-Li Hu、Huan Wang、Jia-Xing Lu
DOI:10.1039/d0nj01728k
日期:——
carbon (Cu/PC) composites were facilely assembled by using a one-pot hydrothermal approach combined with calcination under a N2 atmosphere, and were used for the electrocatalytic synthesis of cyclic carbonates from CO2 and diols at room temperature and normal pressure without any other catalysts. The results show that the Cu/PC composites with large specific surface areas (SBET > 279 m2 g−1) and high pore
在N 2气氛下,通过单锅水热法与煅烧相结合,轻松组装生物质衍生的Cu / PC(Cu / PC)复合材料,并用于在室温下由CO 2和二醇电催化合成环状碳酸酯。温度和常压下没有任何其他催化剂。结果表明,具有较大比表面积(S BET > 279 m 2 g -1)和高孔容(V p > 0.47 cm 3 g -1)的Cu / PC复合材料具有良好的CO 2催化活性。电催化固定。Cu纳米颗粒均匀地分散在PC中,与纯PC和Cu板相比,复合材料的催化活性显着提高。另外,Cu含量影响电催化活性。在所用的材料中,Cu / PC-III是最好的阴极,因为它具有46.3%的碳酸亚丙酯的电合成产率,具有广阔的应用前景,并且适合于其他邻二醇的合成。4-丙基-1,3-二氧戊环-2-酮的产率达到57.8%。所制备的复合材料还显示出令人满意的可重复使用性,即使使用六次循环,产率也不会降低。这些结果表明,该复合材料可有效地用于从CO
Design of bifunctional quaternary phosphonium salt catalysts for CO<sub>2</sub> fixation reaction with epoxides under mild conditions
An efficient synthesis of cyclic carbonates from epoxides and CO2 under mild reaction conditions was achieved via the use of a newly designed bifunctional quaternaryphosphoniumiodide catalyst. The importance...