Electrostatic self-assembly and covalent

Alternatively, Tezuka et al. have proposed an electrostatic self-assembly and covalent fixation process for the effective synthesis of monocyclic and three dicyclic polymer structures [124,125]. The key reaction for formation of cyclic polymers is an electrostatic self-assembly and covalent fixation process, as indicated in Fig. 36. 

In order to selectively construct such polymer topologies, an electrostatic self-assembly and covalent fixation (ESA-CF) process has been developed which employs a linear or star telechelic precursor having cyclic ammonium salt end groups, accompanied by a plurifunctional carboxylate counterion [6-8]. This combination... 

Cyclic polymers, having one or two functional groups, are termed as kyklo-telechelics with analogy to the Greek word kyklos (which means cyclic). Such telechelics can be prepared again by the electrostatic self-assembly and covalent fixation process as depicted in reaction (118). 

Upon these developments, topologically signihcant polymers have now become an attractive challenge in synthetic polymer chemistry to extend the frontier of the field. In this respect, the electrostatic self-assembly and covalent fixation (ESA-CF) process (Section 1.2) provides a unique opportunity to construct various complex polymer topologies, either by the direct application or by the combination with the effective polymer linking process such as a metathesis condensation and/or a click coupling processes. 

Oike, H., Imaizumi, H., Mouri, T. et al. (2000) Designing unusual polymer topologies by electrostatic self-assembly and covalent fixation. Journal of the American Chemical Society, 122,9592-9599. 

Oike, H., Hamada, M., Eguchi, S. et al (2001a) novel synthesis of single- and double-cyclic polystyrenes by electrostatic self-assembly and covalent fixation with telechelics having cyclic ammonium salt groups. Macromolecules, 34,2776-2782. 

Tezuka, Y, Tsuchitani, A., and Oike, FI. (2004) Synthesis of polymeric topological isomers through electrostatic self-assembly and covalent fixation with star telecheUc precursors. Macromolecular Rapid Communications, 25,1531-1535. 

Adachi, K., Irie, H., Sato, T. et al. (2005) Electrostatic self-assembly and covalent fixation with cationic and anionic telechelic precursors for new loop and branch polymer topologies. Macmmolecules, 38,10210-10219. 

Scheme 8 Synthesis of cyclic poly(THF) by an electrostatic self-assembly and covalent fixatim. (ESA-CF) process...

Oike, H., H. Imaizumi, T. Mouri, Y. Yoshioka, A. Uchibori, and Y. Tezuka, Designing Unusual Polymer Topologies by Electrostatic Self Assembly and Covalent Fixation, J. 

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