1,5,9-Trioxacyclododecane and 3,3,7,7,11,11-hexamethyl-1,5,9-trioxacyclododecane: novel lithium cation complexing agents
作者:Johannes Dale、Jan Eggestad、Siw B. Fredriksen、Per Groth
DOI:10.1039/c39870001391
日期:——
derivative, obtained in good yield from oxetane and from 3,3-dimethyloxetane, give stronger complexation than the corresponding 16-crown-4 ligands, and the high selectivity for lithium as compared with sodium and magnesium is retained for Me6-12-crown-3, but is lost for 12-crown-3 owing to the formation of sandwich complexes; X-ray crystal structures are reported for 12-crown-3·LiNCS, Me6-12-crown-3·LiClO4
由氧杂环丁烷和3,3-二甲基氧杂环丁烷获得的高收率的12-Crown-3及其六甲基衍生物比相应的16-Crown-4配体具有更强的络合性,与钠和镁相比,对锂的高选择性为保留给我6 -12-crown-3,但由于形成三明治复合物而失去给12-crown-3;报告了12-冠-3·LiNCS,Me 6 -12-冠-3·LiClO 4和Me 6 -12-冠-3的X射线晶体结构。