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冠醚对金属离子具有高选择性的络合活性,近十余年来发展很快。但是,冠醚也有其弱点:合成困难,产率低,价格昂贵。Simon和Vogtle等在本世纪七十年代又发掘了开链冠醚:(醚型开链冠醚)和(酰胺型开链冠醚)等。开链冠醚除具有选择性络合金属离子的特点之外,还具有易于合成、结构富于变化等优点。酰胺型开链冠醚现已有数种可作为离子选择性膜电极的活性物质。开链冠醚三甘酰双二苄胺是钠离子选择性PVC膜电极的活性物质,其合成方法文献中未见有具体记载。据报导,三甘酰双二苄胺的类似物三甘酰双二苯胺是在大过量吡啶存在下用Einhorn酰化反应制得的。但我们在重
Crown ether on the metal ion with high selectivity of complex activity, the rapid development of the past 10 years. However, crown ethers also have their weaknesses: difficulties in synthesis, low yields and high costs. Simon and Vogtle in the seventies of this century also discovered the open-chain crown ether: (ether type open-chain crown ether) and (amide open-chain crown ether) and so on. In addition to the open-chain crown ether has the characteristics of selective complexation of metal ions, but also has the advantages of easy synthesis, structural changes and other advantages. Amide open-chain crown ethers are now available as an ion-selective membrane electrode active material. Open-chain crown ether triglyceride bis-dibenzylamine is a sodium ion-selective PVC membrane electrode active material, the synthesis method has not been specifically documented in the literature. It has been reported that the analogue troglycobisdiphenylamine of tricapridylbisdibenzylamine is obtained by acylation with Einhorn in the presence of a large excess of pyridine. But we are heavy