Cyclodextrin-Based Size-Complementary [3]Rotaxanes: Selective Synthesis and Specific Dissociation
作者:Yosuke Akae、Yasuhito Koyama、Shigeki Kuwata、Toshikazu Takata
DOI:10.1002/chem.201405005
日期:2014.12.15
with alkylene axles were prepared in one‐pot by end‐capping reactions with aryl isocyanates in water. The selective formation of [3]rotaxane with a head‐to‐head regularity was indicated by the X‐ray structural analyses. Thermal degradation of the [3]rotaxanes bearing appropriate end groups proceeded by stepwise dissociation to yield not only the original components but also [2]rotaxanes. From the kinetic
通过与水中的异氰酸芳基酯进行封端反应,在一个锅中制备基于α-环糊精(CD)的具有亚烷基轴的尺寸互补[3]轮烷。X射线结构分析表明,具有头对头规律性的[3]轮烷的选择性形成。带有适当端基的[3]轮烷的热降解通过逐步离解进行,不仅产生了原始组分,而且还产生了[2]轮烷。从流失的动力学曲线,发现[2]轮烷的最大产率估计为94%。对此类轮烷的热力学研究和NOESY分析表明,[2]轮烷特别稳定,可以通过控制端基的结构,CD基团的方向来调节[3]轮烷与组分的离解能力,