Towards Functional Fluorous Surfactants. Synthesis and Spectroscopic Features of Systematically Modified Sugar-Substituted Fluorous 1,2,3-Triazoles
作者:Ahmed M.A. Ahmed、Adnan I. Mohammed、Roger W. Read
DOI:10.1016/j.jfluchem.2020.109519
日期:2020.6
of homologous compounds making up a total of 30 new, fluorous 1-substituted 1,2,3-triazol-4-ylmethyl(and ethyl) ether surfactant candidates, with highly systematic variations in substituent position and type, have been synthesised in consistently good yields by processes involving copper(I)-accelerated Huisgen-Meldal dipolar cycloaddition reactions. Each series contains a perfluorobutylethyl, perfluorohexylethyl
Synthesis of modified monosaccharides, derivatives of glucose and galactose, having a highly fluorinated chain, as a library of synthetic buildingblocks for hyaluronicacid (HA) modified subunits has been developed. “Click” chemistry has been employed as a strategy for the synthesis of these molecules. 1,2,3-triazole ring derivatives were obtained with good to excellent yields.
Probing the effect of electron donation on CO2 absorbing 1,2,3-triazolide ionic liquids
作者:Robert L. Thompson、Wei Shi、Erik Albenze、Victor A. Kusuma、David Hopkinson、Krishnan Damodaran、Anita S. Lee、John R. Kitchin、David R. Luebke、Hunaid Nulwala
DOI:10.1039/c3ra47097k
日期:——
Development of the next generation materials for effective separation of gases is required to address various issues in energy and environmental applications. Ionic liquids (ILs) are among the most promising material types. To overcome the many hurdles in making a new class of materials technologically applicable, it is necessary to identify, access, and scale up a range of representative substances. In this work, CO2 reactive triazolide ILs were synthesized and characterized with the aim of developing a deeper understanding of how structural changes affect the overall properties of these substances. It was found that substituents on the anion play a crucial role in dictating the physical properties for CO2 capture. Depending upon the anion substituent, CO2 capacities between 0.07 and 0.4 mol CO2 per mol IL were observed. It was found that less sterically-hindered anions and anions containing electron donating groups were more reactive towards CO2. Detailed spectroscopic, CO2 absorption, rheological, and simulation studies were carried out to understand the nature and influence of these substituents. The effect of water content was also evaluated, and it was found that water had an unexpected impact on the properties of these materials, resulting in an increased viscosity, but little change in the CO2 reactivity.
要解决能源和环境应用中的各种问题,就必须开发有效分离气体的下一代材料。离子液体 (IL) 是最有前途的材料类型之一。为了克服在技术上应用一类新材料的诸多障碍,有必要识别、获取和放大一系列具有代表性的物质。在这项研究中,我们合成了二氧化碳活性三唑烷基惰性化合物并对其进行了表征,目的是深入了解结构变化如何影响这些物质的整体特性。研究发现,阴离子上的取代基在决定二氧化碳捕获的物理性质方面起着至关重要的作用。根据阴离子取代基的不同,每摩尔 IL 的二氧化碳捕获能力介于 0.07 至 0.4 摩尔 CO2 之间。研究发现,立体阻碍较少的阴离子和含有电子捐赠基团的阴离子对二氧化碳的反应性更强。为了解这些取代基的性质和影响,进行了详细的光谱、二氧化碳吸收、流变和模拟研究。此外,还评估了水含量的影响,结果发现水对这些材料的性质产生了意想不到的影响,导致粘度增加,但二氧化碳反应性几乎没有变化。
Towards functional fluorous surfactants. Synthesis of hydrophilic fluorous 1,2,3-triazolylmethyl ethers and di(1,2,3-triazolylmethyl) ethers
作者:Dominic V. Francis、D. Howard Miles、Adnan I. Mohammed、Roger W. Read、Xiaobei Wang
DOI:10.1016/j.jfluchem.2011.07.002
日期:2011.11
Copper(I)-accelerated Huisgen-Meldal dipolar cycloaddition reactions between polyfluoroalkyl azides and propargyl ethers of n-octanol and of triethyleneglycol monomethyl ether exhibited variation in yield of 1,2,3-triazol-4-ylmethyl ethers. Microwave acceleration, and in situ generation of the azides, provided improvements in yield and efficiency. In contrast, very good yields of equivalent fluorous triazoles were obtained from a range of n-alkyl azides with propargyl ethers of perfluorohexylethanol and of perfluoroheptylmethanol through conventional copper(I)-promoted reactions. Together, the resulting substances with systematic variations in polyfluoroalkyl and alkyl substituent length and position of substitution, and degree of oxygen content, make up small libraries of hybrid fluorous 1,2,3-triazol-4-ylmethyl ethers as candidates for study as hydrophilic fluorous surfactants. In addition, a pilot sample of di(1,2,3-triazol-4-ylmethyl) ethers with 1'-octyl-1-polyfluoroalkyl-substituents and 1'-nonyl-1-perfluorooctylethyl substituents were synthesised for the first time in an effort to develop more functional, fluorous surfactants. (C) 2011 Elsevier B.V. All rights reserved.
Synthesis of Novel Silanes Functionalized with Mono- and Bis-Fluoroalkylated [1,2,3]-Triazoles
作者:Lu Cai、Yanhua Yuan、Zhanxiong Li、Wanjun Wang
DOI:10.1080/10426507.2015.1032411
日期:2015.11.2
In the current work, a series of mono-fluoroalkylated [1,2,3]-triazole precursors was prepared by the 1,3-dipolar cycloaddition reaction of allyl azide and perfluoroalkylethoxyl propynes, in which the CuSO4 and sodium ascorbate were used as the catalyst. Using these precursors as unsaturated substrates, a series of novel mono-fluoroalkyldichloromethyl silanes were successfully synthesized via hydrosilylation between CC and Si-H bonds. Furthermore, to construct fluorosilanes with two or more stacked fluoroalkyl groups in one molecule, silanes with bis-fluoroalkylated [1,2,3]-triazoles as pendants were synthesized afterwards.