By Toshikazu Takata, Nobuhiro Kihara, Yoshio Furusho (auth.)
1. T. Takata, N. Kihara, Y. Furusho: Polyrotaxanes and Polycatenanes: fresh Advances in Syntheses and purposes of Polymers Comprising of Interlocked Structures.- 2. M. Suginome, Y. Ito: Transition Metal-Mediated Polymerization of Isocyanides.- three. okay. Osakada, D. Takeuchi: Coordination Polymerization of Dienes, Allenes and Methylenecycloalkanes.
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Extra info for Polymer Synthesis
Stable bis(1,10-phenanthroline) copper(I) complex has a tetrahedral coordination structure, and two Scheme 29 Polyrotaxanes and Polycatenanes: Recent Advances in Syntheses and Applications 39 phenanthroline ligands are perpendicular to each other. When 2,9-disubstituted 1,10-phenanthroline is used for the preparation of copper(I) complex, the cyclization at the substituents affords interlocked macrocycles. Based on this strategy, it has been proven that 2,9-disubstituted 1,10-phenanthrolinecopper(I) complex is an excellent scaffold for the construction of interlocked compounds.
Group is not bulky enough to prevent deslipping under all circumstances. Anyhow, the polypseudorotaxane has a more rotaxane-like character than other polypseudorotaxanes reported to date and can be categorized in a new class of polymeric compounds. The synthesis of first polyrotaxane, a real tour de force, was finally accomplished by Takatas group in early 2003 (Scheme 47) . , bis(dibenzo-24-crown-8 ether) and bis(secondary ammonium salt) having a centrally-located disulfide linkage and two di-tert-butylphenyl groups at both termini.
Vögtle et al. prepared oligorotaxanes by the threading-endcapping method, although the yield was very low (2% in the case of rotaxane) (Scheme 34) . When the cyclic component of the rotaxane has low symmetry, planar chirality based on the direction of the rotation occurs (Scheme 35). Vuogtle Scheme 35 et al. reported the isolation of both enantiomers and meso-type rotaxanes by chiral HPLC technique [194, 195]. Since the selective alkylation of the sulfonamide group was achieved in the presence of carboxamide, various rotaxane assemblies were successfully prepared by the alkylation of secondary amide-based rotaxane bearing sulfonamide moiety [196, 197].
Polymer Synthesis by Toshikazu Takata, Nobuhiro Kihara, Yoshio Furusho (auth.)