Synthesis of Cage-Type Molecules with π-Cavity and Selective Gas-Phase Cation Complexation
作者:Jeongryul Kim、Young Kook Kim、Nokyoung Park、Jong Hoon Hahn、Kyo Han Ahn
DOI:10.1021/jo050654w
日期:2005.9.1
of ammonium and alkali metal cations through cation−π interactions. The synthesis involved a key cyclization step, which was markedly dependent on the capping component. Binding studies by electrospray ionization mass spectrometry toward lithium, sodium, potassium, and ammonium cations showed that the cage-type molecules selectively form a 1:1 complex. A competitive binding study showed that cage 3c
合成了由苯基壁和帽盖组成的笼型分子,作为通过阳离子-π相互作用结合铵盐和碱金属阳离子的主体。该合成涉及关键的环化步骤,该步骤明显取决于封端组分。通过电喷雾电离质谱对锂,钠,钾和铵阳离子的结合研究表明,笼型分子选择性地形成1:1的络合物。一项竞争性结合研究表明,笼子3c(R = Et,R'= OMe)偏爱锂阳离子,而笼子4b(R = Me,R'= OMe)在存在其他离子时,对锂离子和铵离子有相似的偏爱。选择性地通过笼型化合物的浇口尺寸而不是通过其腔体尺寸来解释这种选择性模式。