Preorganized Ligand Arrays Based on Spirotetrahydrofuranyl Motifs. Synthesis of the Stereoisomeric 1,8,14-Trioxatrispiro[4.1.4.1.4.1]octadecanes and the Contrasting Conformational Features and Ionic Binding Capacities of These Belted Ionophores
作者:Leo A. Paquette、Jinsung Tae、Eugene R. Hickey、William E. Trego、Robin D. Rogers
DOI:10.1021/jo001430a
日期:2000.12.1
and Na(+) ions, as well as to CH(3)NH(3)(+). Whereas the 3eq conformation is populated in the solid state and in solution, complex formation occurs readily. (13)C NMRstudies have defined slow exchange limits as the 2:1 sandwich complex with lithiumion is initially formed and transformed progressively into a 1:1 species upon the addition of more LiClO(4). Only the 2:1complex with sodium ion is formed