Simple cyclophanes containing four distant amino N atoms or ether O atoms behave as hosts for the threading of guest diarylguanidinium ions. The recognition system exhibits high synthetic flexibility, allowing unique O-free [2]rotaxanes to be synthesized efficiently (yields of up to 80%) through both “threading-followed-by-stoppering” and “clipping” approaches.
包含四个相距遥远的
氨基N原子或醚O原子的简单环烷类充当客体二芳基
胍盐离子穿入的主体。该识别系统具有很高的合成灵活性,可通过“塞子后跟”和“剪裁”两种方法有效地合成独特的不含O的[2]轮
烷烃(产率高达80%)。