大环多元醚是1967年以后出现的一大类中性化合物。其中,大单环多元醚叫王冠醚(crown ethers),而含桥头氮原子的大二环多元醚贝叫窝穴体(crypands)。由于这些化合物具有选择性地络合阳离子,从而使无机盐和碱金属溶于有机溶剂等的特性,所以引起人们很大的兴趣,十余年来,在大环多元醚的理论和实践等各方面,开展了广 The macrocyclic polyethers are a large group of neutral compounds that have emerged since 1967. Among them, the macrocyclic polyethers are called crown ethers, while the big bicyclic polyethers with nitrogen atoms are called crypands. Since these compounds have the property of selectively complexing cations to dissolve inorganic salts and alkali metals in organic solvents and the like, there has been a great deal of interest. For more than ten years, the theory and practice of macrocyclic polyethers Aspects, carried out wide