Self-organization is the key. A series of dendritic pseudorotaxanes were efficiently constructed from complementary building blocks-namely, a three-armed, triply charged ammonium salt and the first, second, and third generations of benzyl ether dendrons bearing the dibenzo[24]crown-8 moiety. The pseudorotaxane arising from the third-generation dendron is shown in the picture.
合成这些 d'un 对 «commutable redox» d'analogues de monobenzo-21 Crown-7 (Cr) avec un groupe dithiol en position α,ω(Cr red ) et une liaison disulfure dans le cycle (Cr ox )。L'interconversion entre ces 2 formes est obtenue par traitement avec des reactifs redox。Donnees sur les proprietes ionophores de ces composes, Cr ox transportant les ions Cs + 6,2 fois plus vite que Cr red a travers une membrane liquide
comprising 23‐ and 26‐membered biphenyl crownethers as the macrocyclic components and secondary ammonium ions as the dumbbell‐shaped components, and the locking of the dynamic axial chirality of the biphenyl moieties in these structures. Chiral high‐performance liquid chromatography (HPLC) revealed that our [2]rotaxane featuring the 26‐membered crownether racemized at room temperature, but the racemization