Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. Engl. 10/1989)
The cover picture shows a computer-generated space-filling model (D. Williams) of the structure of a highly ordered  catenane. This compound could be prepared in a one-pot synthesis in a yield of 70% (for comparison, use of the high-dilution technique generally affords yields of around 1%). The initially formed decaoxa[13.13]paracyclophane (drawn in red) acts as a template for generation of cyclobis(paraquat-p-phenylene) (drawn in blue) in such a way that, after cyclization, the two ring systems are interlocked. This synthetic principle, involving the exploitation of supramolecular structures, should prove to be very useful. Further details on this catenane, its molecular structure, its dynamic behavior in solution, and its electrochemical properties are reported by J. F. Stoddart et al. on page 1396.