One-Pot Synthesis of Cyclic Carbonates from Aldehydes, Sulfur Ylide, and CO2
作者:Arumugam Sudalai、Ravindra Aher、B. Kumar
DOI:10.1055/s-0033-1340072
日期:——
CH2=SMe2), in the presence of CO2 (1 atm) bubbled sequentially under mild conditions, produces cyclic carbonates in preparative yields. Sodiumiodide formed in situ promotes the reaction between epoxide as intermediate and CO2 at ambient conditions, thus constituting a powerful metal-free synthesis of organic cyclic carbonates directly from aldehydes.
在温和条件下连续鼓泡的 CO2 (1 atm) 存在下,用硫叶立德(CH2=SOMe2 或 CH2=SMe2)处理醛,以制备收率生成环状碳酸酯。在环境条件下,原位形成的碘化钠促进了作为中间体的环氧化物与 CO2 之间的反应,从而构成了直接由醛类强有力的无金属有机环状碳酸酯合成。
Iron-Catalyzed Synthesis of Five-Membered Cyclic Carbonates from Vicinal Diols: Urea as Sustainable Carbonylation Agent
A new iron-catalyzed synthesis of cyclic carbonates from the corresponding vicinal diols and urea is described. This straightforward transformation allows for the preparation of a variety of five-membered carbonates by employing an inexpensive and environmentally benign iron salt as the catalyst. The use of readily available feedstocks such as urea and polyols makes this a sustainable process. As ammonia
Cooperative Catalysis of Cyclic Carbonate Ring Opening: Application Towards Non-Isocyanate Polyurethane Materials
作者:Vince M. Lombardo、Elizabeth A. Dhulst、Emily K. Leitsch、Nathan Wilmot、William H. Heath、Anthony P. Gies、Matthew D. Miller、John M. Torkelson、Karl A. Scheidt
DOI:10.1002/ejoc.201500313
日期:2015.5
The reaction between cyclic carbonates and amines to produce hydroxyurethanes is an important alternative to current urethane chemistry. In order to address the issue of slow reactionrates, an efficient ring opening of cyclic carbonates with amines has been achieved utilizing cooperative catalysis. A new Lewisacid/Lewis base combination substantially decreases the reaction times for small molecule
Multi-step oxidative carboxylation of olefins with carbon dioxide by combining electrochemical and 3D-printed flow reactors
作者:Diego Iglesias、Cristopher Tinajero、Simone Marchetti、Ignazio Roppolo、Marcileia Zanatta、Victor Sans
DOI:10.1039/d3gc03360k
日期:——
The selective oxidation of alkenes to form epoxides followed by the cycloaddition of CO2 is a sustainable and cost-efficient method to generate functional cyclic carbonates. The use of a continuous-flow process allows seamless integration of both reactions sequentially under tailored and optimised conditions for each of the transformations to produce the cyclic carbonates. Here, we successfully demonstrate
烯烃选择性氧化形成环氧化物,然后进行CO 2环加成是一种可持续且经济高效的生成功能性环状碳酸酯的方法。使用连续流工艺可以在每次转化的定制和优化条件下连续无缝整合两个反应,以生产环状碳酸酯。在这里,我们成功演示了烯烃电氧化,然后通过 CO 2环加成,使用 3D 打印 (3DP) 反应器连续流动生产环状碳酸酯,无需中间纯化步骤。这种方法非常方便,因为电化学反应中的电解质(铵盐)也在环加成反应中充当催化剂。评估了电化学氧化中的不同参数(例如溶剂、电极、电解质、浓度和电流强度)。观察到环氧化物形成的完全转化和高选择性(>80%)。电解质充当环加成反应的催化剂。3DP 反应器的数字设计在环加成反应的高效进行中发挥了至关重要的作用,与盘管和填充床反应器相比,其生产率提高(时空产率为 4.38 g prod h -1 L -1 ) 。还评估了连续的CO 2环加成反应,观察到苯乙烯的环状碳酸酯的总产率为8
ONE STEP PROCESS FOR SYNTHESIS OF CYCLIC CARBONATES
申请人:Council of Scientific & Industrial Research
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