高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (8): 812.
• 研究论文 • 上一篇 下一篇
陆国元, 王德枌, 胡宏纹
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中国科学院科学基金
Lu Guoyuan, Wang Defen, Hu Hongwen
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摘要: 由4,6-二氯-5-硝基嘧啶、2,4-二氯-5-硝基-6-甲基嘧啶分别与4'-氨基苯并冠醚反应合成了6种以嘧啶环为桥链的新双冠醚,其中分别含有苯并-12-冠-4(A1,B1)、苯并-15-冠-5(A2,B2)和苯并-18-冠-6(A3,B3)单元,用这些双冠醚的氯仿溶液对碱金属苦味酸盐水溶液进行了萃取,计算了萃取平衡常数K-e。结果表明双冠醚(A1,B<1)、(A2,B2)和(A3,B3)分别对钠、钾和铯具有较高的萃取能力,其选择性显著优于相应的单冠醚。
关键词: 双冠醚, 嘧啶环, 萃取平衡常数, 电导法
Abstract: Six bis-crown ethers containing benzo-12-crown-4(A1,B1), benzo-15-crown-5(A2,B2) and benzo-18-crown-6(A3,B3) moieties bridged by pyrimidine ring were prepared by the reaction of 4,6-dichloro-5-nitropyrimidine, 2, 4-dichloro-5-nitro-6-methylpyrimidine with the 4'-aminoben-zocrown ethers, respectively.Extractions were carried out from aqueous solution of alkali metal pi-crates with these bis-crown ether solutions in chloroform.The extraction equilibrium constants were also evaluated.The results indicate that compound (A1,B1), (A2,B2) and (A3,B3) are effective extracting reagents for sodium, potassium and caesium, respectively.The cation-selectivity is more effective than the corresponding monocyclic crown ethers.
Key words: Bis-crown ether, Pyrimidine ring, Extraction equilibrium constant, Conductometry
TrendMD:
陆国元, 王德枌, 胡宏纹. 含嘧啶环的双冠醚(Ⅱ). 高等学校化学学报, 1989, 10(8): 812.
Lu Guoyuan, Wang Defen, Hu Hongwen . Bis-Crown Ether Containing Pyrimidine Ring (Ⅱ). Chem. J. Chinese Universities, 1989, 10(8): 812.
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