N,N′-Diarylsquaramides: General, High-Yielding Synthesis and Applications in Colorimetric Anion Sensing
摘要:
Zinc trilluoromethanesullonate promotes efficient condensations of anilines with squarate esters, providing access to symmetrical and unsymmetrical squaramides in high yields from readily available starting materials. Efficient access to electron-deficient diaryl squaramides has enabled a systematic investigation of the colorimetric anion-sensing behavior of a p-nitro-substituted squaramide. Its behavior differs in dramatic and unexpected ways from that of structurally similar p-nitroaniline-based ureas, an effect that highlights the remarkable differences in acidity between the squaramide and urea functional groups. Computational studies illustrating the enhanced hydrogen bond donor ability and acidity of squaramides in comparison to ureas are presented.
Ionic Liquid Driven Nucleophilic Substitution of Squaric Acid to Squaramides
作者:Peera Acharasatian、Siraporn Soonthonhut
DOI:10.1055/a-1795-8322
日期:2022.9
crucial encumbrance for the synthesis of squaramides through nucleophilic substitution of squaric acid. The reactions must be performed in an aqueous medium since squaric acid is insoluble in virtually all organic solvents. The scope of amine nucleophiles was consequently restricted to those amines soluble in water. Owing to remarkable solvating ability of ionicliquid, reactions of squaric acid with
<i>N</i>,<i>N′</i>-Diarylsquaramides: General, High-Yielding Synthesis and Applications in Colorimetric Anion Sensing
作者:Ali Rostami、Alexis Colin、Xiao Yu Li、Michael G. Chudzinski、Alan J. Lough、Mark S. Taylor
DOI:10.1021/jo100104g
日期:2010.6.18
Zinc trilluoromethanesullonate promotes efficient condensations of anilines with squarate esters, providing access to symmetrical and unsymmetrical squaramides in high yields from readily available starting materials. Efficient access to electron-deficient diaryl squaramides has enabled a systematic investigation of the colorimetric anion-sensing behavior of a p-nitro-substituted squaramide. Its behavior differs in dramatic and unexpected ways from that of structurally similar p-nitroaniline-based ureas, an effect that highlights the remarkable differences in acidity between the squaramide and urea functional groups. Computational studies illustrating the enhanced hydrogen bond donor ability and acidity of squaramides in comparison to ureas are presented.
Development of the Squaramide Scaffold for High Potential and Multielectron Catholytes for Use in Redox Flow Batteries
作者:Jacob S. Tracy、Conor H. Broderick、F. Dean Toste
DOI:10.1021/jacs.3c14776
日期:——
these scaffolds. Three lead compounds were developed: a highly stable one-electron SQX material with an oxidation potential of 0.51 Vvs Fc/Fc+ that maintained 99% of peak capacity after 102 cycles (51 h) when incorporated into a 1.58 V flow battery; a high-potential one-electron SQA material with an oxidation potential of 0.81 Vvs Fc/Fc+ that demonstrated negligible loss of redox active material as