title: Dual selectivity expressed in [2 + 2 + 1] dynamic clipping of unsymmetrical [2]catenanes.
abstract: A pi-templated dynamic [2 + 2 + 1] clipping protocol is established for the synthesis of [2]catenanes from two parts dialdehyde, two parts diamine, and one part tetracationic cyclophane. It is further diversified for the selective formation of an unsymmetrical [2]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 (1)H NMR spectroscopy, X-ray single-crystal structural studies, and exchange experiments.
authors.affiliation: The Molecular Foundry and the Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Gayane
authors.initials: G
authors.lastname: Koshkakaryan
authors.forename: Dennis
authors.initials: D
authors.lastname: Cao
authors.forename: Liana M
authors.initials: LM
authors.lastname: Klivansky
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Teat
authors.forename: Jasper L
authors.initials: JL
authors.lastname: Tran
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
mesh_terms: D043863:Catenanes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D003500:Cyclization; D008958:Models, Molecular; D015394:Molecular Structure; D013816:Thermodynamics
chemical_list: D043863:Catenanes