Imidazolium Cations with Exceptional Alkaline Stability: A Systematic Study of Structure–Stability Relationships
摘要:
Highly base-stable cationic moieties are a critical component of anion exchange membranes (AEMs) in alkaline fuel cells (AFCs); however, the commonly employed organic cations have limited alkaline stability. To address this problem, we synthesized and characterized the stability of a series of imidazolium cations in 1, 2, or 5 M KOH/CD3OH at 80 degrees C, systematically evaluating the impact of substitution on chemical stability. The substituent identity at each position of the imidazolium ring has a dramatic effect on the overall cation stability. We report imidazolium cations that have the highest alkaline stabilities reported to date, >99% cation remaining after 30 days in 5 M KOH/CD3OH at 80 degrees C.
Expeditious and Highly Efficient One-Pot Synthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate
作者:Krishna Indalkar、Sanjay S. Malge、Anil S. Mali、Ganesh U. Chaturbhuj
DOI:10.1080/00304948.2021.1920304
日期:2021.7.4
(2021). Expeditious and Highly Efficient One-PotSynthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate. Organic Preparations and Procedures International: Vol. 53, No. 4, pp. 387-396.
COF@Fe3O4 under hydrothermal conditions for the first time. The high surface area magnetic COF could exhibit superior catalytic activity for sustainable synthesis of trisubstituted and tetrasubstituted imidazoles and pyrroles in good to excellent yields in PEG as solvent under environmentally friendly, ambient conditions and making the overall process economical, efficient, and green. The retrievable
为环境良性过程的广泛应用设计廉价而高效的纳米多孔磁性催化剂是一个极具吸引力且具有挑战性的化学研究领域。通过三聚氰胺与对苯二醛在3,4-二羟基苯甲醛包覆磁性Fe 3 O 4纳米颗粒COF@Fe 3 O 4表面缩合反应制备新型多孔磁性共价有机骨架第一次在热液条件下。高表面积磁性 COF 可以在环境友好、环境条件下以 PEG 作为溶剂的良好收率,对三取代和四取代咪唑和吡咯的可持续合成表现出优异的催化活性,并使整个过程经济、高效和绿色。PEG中的可回收催化剂是通用的,适用于广泛的底物范围和官能团兼容性。通过FTIR、XRD、EDX和SEM光谱对COF@Fe 3 O 4的结构和形貌进行了表征。COF@Fe 3 O 4 磁性催化剂通过外部磁铁回收并使用多个循环而没有显着的催化活性损失。
Boehmite nanoparticles, an efficient green catalyst for the multi-component synthesis of highly substituted imidazoles
Boehmite nanoparticles (AlOOH NPs) was found to be a highly active and green catalyst for the synthesis of highlysubstitutedimidazoles under solvent-free conditions. This one-pot procedure is very simple, and affords good to excellent yields. Furthermore, the catalyst shows good thermal stability and recyclability. The catalyst was recycled for five runs without an appreciable loss in its catalytic
Piperidinium Hydrogen Sulfate (PHS) as an Efficient Ionic Liquid Catalyst for the Synthesis of Imidazole Derivative under Solvent‐Free Condition
作者:Mustafa R. Albayati、Adel. A. Marzouk、Antar A. Abdelhamid
DOI:10.1002/jhet.3525
日期:2019.5
Piperidinium hydrogen sulfate is used as a very important new catalyst for the synthesis of the biologically active compounds from a series of multi‐substituted imidazole components by the simple reaction of benzyl with different aromatic aldehydes, ammonium acetate, and phenethylamine or butylamine as amine derivatives. The key merits of this method are very shorter reaction times, excellent yield
IMIDAZOLIUM CATIONS WITH EXCEPTIONAL ALKALINE STABILITY
申请人:Cornell University
公开号:EP4108691A1
公开(公告)日:2022-12-28
The invention provides a compound of formula (II):
wherein:
R1 is
wherein ∗ represents the point of attachment to the nitrogen atom at position 1 of the imidazolium ring;
m is 0 or 1;
n is 1-8, provided that the sum of m + n does not exceed 8;
R2 is phenyl substituted with 0 to 3 substituents R6 individually selected from C1-C3 alkyl;
R3 is selected from C2-C16 hydrocarbyl;
R4 and R5 are individually selected from C1-C16 hydrocarbyl, or taken together R4 and R5, together with the carbon atoms to which they are attached, form a ring selected from benzene, cyclooctene and norbornene; and
X- is a counterion.