一、序言冠醚是1967年以来新发展起来的一类新型络合剂,即单环向心配合体(Monocyclic ligands)。它有芳环族冠醚和脂环族冠醚之分,其结构式及命名举例列于表1中。这些环状冠醚分子中都含有未共享电子对的氧原子,它对金属阳离子(主要是碱金属和碱土金属的阳离子)具有较强的络合能力,从而可以大大提高与阳离子对应的阴离子的活性,以加速反应的进行(如氧化反应、阴离子聚合反应等),所以冠醚目前已成为化学 First, the preamble Crown ether is a new type of complexing agent newly developed since 1967, namely monocyclic ligand complexes (Monocyclic ligands). It has the aromatic ring crown ether and alicyclic crown ether points, the structural formula and named examples are listed in Table 1. Each of these cyclic crown ether molecules contains oxygen atoms that are not shared electron pairs and has a strong ability to complex metal cations (mainly cations of alkali metals and alkaline earth metals), so that the cation-corresponding anion Activity to speed up the reaction (such as oxidation, anionic polymerization, etc.), so the crown ether has now become a chemical