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冠醚改性聚甲基硅氧烷液膜离子传输性能 总被引:2,自引:0,他引:2
合成了两种新型的冠醚改性聚甲基硅氧烷,研究了它们作为液膜离子传输载体对离子的传输性能,并考察了膜的稳定性。 相似文献
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p-tert-Butylcalix[6]-1,4-2,5-biscrown-4 is a typical member of the family of calix[6]crowns. In the literature, the compound was synthesized from calix[6]arene by two steps and the overall yield based on calix[6]arene was 24%.Herein we wish to report a one-pot method to do this work. By this method the yield was up to 48% and the reaction time was greatly reduced. 相似文献
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逐步法合成杯[4]芳烃关环反应的改进 总被引:2,自引:0,他引:2
对位带有3种或4种不同取代基的杯「4]芳烃一般通过逐步合成法合成.50年代后期,wS和Hllfl比rI'·'a就用[1十1十1十工]的逐步法9步合成出了杯[4]芳烃,总产率相当低·1979年B6hmer等['·'报道用对位取代酚的线型三聚体与2,6一双溪甲基对取代酚在乙酸中进行关环反应合成杯[4」芳烃,这种[3+l」的逐步法只需3步连续反应就能合成带有3种不同取代基的杯卜」芳烃,但最后。步关环产率仍然很低(2%、15%)[".后来*dhmeTD'等将关环反应改进为在TICI。/二氧六环体系中进行,产率有所提高,这种逐步法曾用于不对称杯[4」芳烃的… 相似文献
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Xiong Li Shu-Ling Gong Wei-Ping Yang Yan Li Yuan-Yin Chen Xiang-Gao Meng 《Journal of inclusion phenomena and macrocyclic chemistry》2010,66(1-2):179-184
A novel mono-ionizable receptor 2 possessing three aminopyridyl and one carboxylic group in 1,3-alternate conformation based on thiacalix[4]arene, confirmed by single crystal X-ray analysis, was prepared. For competitive solvent extraction of alkali metal (Na+, K+ and Cs+) and some transition metal (Cu2+, Zn2+, TI+, Ag+) cations from aqueous solutions into chloroform, it was found that the introduction of proton-ionizable group (carboxylic acid moiety) into the aminopyridyl-thiacalix[4]arene derivative could further improve its Ag+ extractability with high selectivity. 相似文献
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合成了两种新的C60侧链线性聚硅氧烷,并用作毛细管气相色谱固定相.该类固定相柱效高,使用温度范围宽,热稳定性好,最高柱温达360℃,基线漂移量为3×10-14~4×10-14nm,对各类位置异构体有独特的分离效果,尤其对高沸点化合物如糖、多环芳烃和邻苯二甲酸酯类有良好的分离选择性. 相似文献