An in situ formed Ca<sup>2+</sup>–crown ether complex and its use in CO<sub>2</sub>-fixation reactions with terminal and internal epoxides
作者:J. Steinbauer、A. Spannenberg、T. Werner
DOI:10.1039/c7gc01114h
日期:——
Calcium punched beyond its weight: An in situ formed Ca2+–crown ether complex showed unprecedented efficiency in cyclic carbonate synthesis.
钙超出了其重量范围:一种原位形成的Ca2+–冠醚复合物在环状碳酸酯合成中表现出前所未有的效率。
One-pot synthesis of oxazolidinones and five-membered cyclic carbonates from epoxides and chlorosulfonyl isocyanate: theoretical evidence for an asynchronous concerted pathway
作者:Esra Demir、Ozlem Sari、Yasin Çetinkaya、Ufuk Atmaca、Safiye Sağ Erdem、Murat Çelik
DOI:10.3762/bjoc.16.148
日期:——
The one-pot reaction of chlorosulfonyl isocyanate (CSI) with epoxides having phenyl, benzyl and fused cyclic alkyl groups in different solvents under mild reaction conditions without additives and catalysts was studied. Oxazolidinones and five-membered cyclic carbonates were obtained in ratios close to 1:1 in the cyclization reactions. The best yields of these compounds were obtained in dichloromethane
METAL CATALYSTS FOR SELECTIVE FORMATION OF CYCLIC CARBONATES, PROCESS FOR PREPARING CYCLIC CARBONATE USING THE SAME AND USE OF CYCLIC CARBONATE
申请人:KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
公开号:US20170081302A1
公开(公告)日:2017-03-23
Provided are a novel metal catalyst for preparing cyclic carbonate, and a method for preparing cyclic carbonate using the same, and more particularly, a method for selectively preparing cyclic carbonate in a high yield and at a higher conversion rate as compared to the existing catalysts, using the metal complex including a ligand represented by Chemical Formula 1 below and a trivalent metal in Group 8 or Group 13 as a catalyst and using various structures of epoxide compounds and carbon dioxide as raw materials. In addition, provided are the prepared cyclic carbonate, and an electrolyte including the same:
in Chemical Formula 1, R
1
is hydrogen, (C1-C20)alkyl or halogen; R
2
is hydrogen, (C1-C20)alkyl, (C1-C20)alkoxy, halogen or nitro.
Verfahren zur gleichzeitigen Herstellung von 1,3-disubstituierten Harnstoffen und 1,2-Diolen
申请人:BASF Aktiengesellschaft
公开号:EP0002526A1
公开(公告)日:1979-06-27
Verfahren zur gleichzeitigen Herstellung von 1,3- disubstituierten Harnstoffen und 1,2-Diolen durch Umsetzung von cyclischen Carbonaten mit Aminen in bestimmtem Mengeverhältnis bei höherer Temperatur.
Die nach dem erfindungsgemäßen Verfahren herstellbaren Harnstoffe I sind wertvolle Ausgengsmaterialien zur Synthese von Farbstoffen und Pflanzenschutzmitteln.
通过环状碳酸盐与胺在高温下按特定数量比反应同时制备 1,3-二取代脲和 1,2-二醇的工艺。 根据本发明的工艺可制备的脲 I 是合成染料和植物保护剂的重要起始原料。