1. In this paper ten lactonic crown ethers weresynthesized, of which seven were new compounds.Theirstructures were confirmed by EA,IR,1HNMR andMS analysis.
   合成了10个内酯型冠醚化合物，其中7个冠醚是新化合物，其结构均由元素分析，及红外、核磁、质谱分析证实。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。