The hitherto longest molecular thread-belt assemblies 8, 29, 32 and 43 based on benzene-connected [3.3]metacyclophane units were prepared by means of a repetitive synthetic method. The preparation of difunctionalized [3.3]metacyclophane units (14, 22, 26) succeeded in good yields by an iteration sequence including the cyclization to the cyclophane skeleton and the derivatization of the ester groups. The covalent linkage of the [3.3]metacyclophane belt parts to the thread part leads to higher product yields compared to cyclophane belts only. The final intermolecular macrocyclizations are done by reaction of diamide, dithiol or dibromide functionalized belt fragments to obtain a minimum of single bridged benzene units in the macrocyclic thread-belt assemblies ("pseudobelts").
通过重复合成法,制备出了基于苯连接的 [3.3]metacyclophane 单元的迄今为止最长的分子线带组合物 8、29、32 和 43。通过包括环化环烷骨架和酯基衍生化在内的迭代序列,成功制备了双官能化[3.3]偏环烷单元(14、22、26),并获得了良好的收率。与仅环烷带相比,[3.3]偏环烷带部分与螺纹部分的共价连接可提高产品收率。最终的分子间大环化是通过二酰胺、二
硫醇或二
溴化物官能化带片段的反应来完成的,以便在大环螺纹带组件("假环")中获得最少的单桥苯单元。