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众所周知,冠醚与碱金属或碱土金属能生成相当稳定的配位化合物。这时,金属离子与冠醚所有氧原子发生配位作用而嵌入大环内穴(如1所示)。冠醚的这一特性使它在相转移反应和有机合成中产生许多有趣的结果。богатский盘等最近报道,由于格氏试剂的碳-金属键具有一定的离子特性,亦能与冠醚形成配位化合物。他们的判据是这种1:1配位化合物的UV谱及
It is well known that crown ethers and alkali metals or alkaline earth metals can form relatively stable coordination compounds. At this moment, the metal ions are coordinated with all the oxygen atoms of the crown ether to be embedded into the inner ring of the macrocyclic ring (as shown in FIG. 1). This characteristic of crown ethers produces many interesting results in phase transfer reactions and organic synthesis. богатский plate recently reported that due to the Grignard’s carbon-metal bond has some ionic properties, but also with crown ether formation of coordination compounds. Their criterion is the UV spectrum and the 1: 1 coordination compound