Dual Selectivity Expressed in [2 + 2 + 1] Dynamic Clipping of Unsymmetrical Catenanes
datasetposted on 02.04.2010, 00:00 by Gayane Koshkakaryan, Dennis Cao, Liana M. Klivansky, Simon J. Teat, Jasper L. Tran, Yi Liu
A π-templated dynamic [2 + 2 + 1] clipping protocol is established for the synthesis of catenanes from two parts dialdehyde, two parts diamine, and one part tetracationic cyclophane. It is further diversified for the selective formation of an unsymmetrical catenane showing great translational selectivity by employing two different dialdehydes in a one-pot reaction. The dual selectivity and the dynamic nature are verified by 1H NMR spectroscopy, X-ray single-crystal structural studies, and exchange experiments.