The variable-temperature 1H and 13C NMR spectra of some N-tosyl diaza crown ethers have been obtained. They are discussed with respect to the preferred conformers of the crowns and the free energies of activation of the interconversional process of the large ring. Both the preferred conformers and the ring interconversional barriers have been found to be strongly dependent on the structure and the ring size of the studied compounds.
一些N-托烷基
乙二醇冠醚的可变温度氢-1和碳-13 NMR谱图已获得。它们在讨论中涉及了
冠醚的优选构象以及大环的互变过程的活化自由能。研究发现,优选构象和环的互变势垒均受到所研究化合物的结构和环尺寸的强烈影响。