Key points are not available for this paper at this time.
A multicatenane is described in which two belts consisting of four annelated rings attached to the wide rims of two calix4arenes are interwoven in such a way that each ring of one belt penetrates two adjacent rings of the other belt and vice versa. The key step of the synthesis of this 8catenane is the exclusive formation of preorganized heterodimers between a multimacrocyclic tetraurea calix4arene and an "open-chain" tetraurea calix4arene containing eight omega-alkenyl groups. When a tetraurea calix4arene containing four alkenyl groups is used, a bis-3catenane is formed analogously.
Wang et al. (2004) studied this question.