title: Sequence-Selective Synthesis of Rotacatenane Isomers.
abstract: Rotacatenane is an interlocked compound composed of two mechanically interlocked macrocyclic components, i.e., a [2]catenane, and one axle component. In this paper we describe the selective synthesis of isomeric rotacatenanes. Two [2]rotaxanes with different phenanthroline moieties were synthesized by the oxidative coupling of an alkyne with a bulky blocking group, which proceeded in the cavity of the macrocyclic phenanthroline-Cu complex. The metal template method was used to install another cyclic component: the tetrahedral Cu(I) complex, which was composed of a [2]rotaxane and an acyclic phenanthroline derivative, was synthesized, and the cyclization of the phenanthroline derivative gave the rotacatenane. The sequential isomers of rotacatenanes were distinguished by (1)H and (13)C NMR spectroscopy.
authors.affiliation: Department of Chemistry, Faculty of Science, Tokyo University of Science , 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.
authors.forename: Ryuto
authors.initials: R
authors.lastname: Hayashi
authors.affiliation: Department of Chemistry, Faculty of Science, Tokyo University of Science , 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.
authors.forename: Petr
authors.initials: P
authors.lastname: Slavík
authors.affiliation: Department of Chemistry, Faculty of Science, Tokyo University of Science , 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Mutoh
authors.affiliation: Research Center for Medical and Dental Sciences, Tokyo Medical and Dental University , 1-5-45 Yushima, Bunkyo, Tokyo, 113-8510, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kasama
authors.affiliation: Department of Chemistry, Faculty of Science, Tokyo University of Science , 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Saito