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For recent reviews for the zwitterionic alternating copolymerization, see; S. Shoda, H. Uyama, S. Kobayashi, “Catalysis in Precision Polymerization”, S. Kobayashi, Ed., Wiley, Chichester, 1997, Chapter 9.
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J. M. Cowie, “Comprehensive Polymer Science”, G. Allen, Ed., Oxford, 1989, Vol. 4, Chapter 22.
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S. Kobayashi, T. Saegusa, “Ring-Opening Polymerization”, K. J. Ivin, T. Saegusa, Ed., Elsevier, New York, N.Y., 1985, Vol. 2, Chapter 11.
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As indicated in Figure 1, copolymer compositions were not strictly 1:1. One explanation is the effect of terminal groups because zwitterionic copolymerizations generally provide relatively low molecular weight polymers. Another possibility is the presence of side reactions, which may be supported by the presence of undefined signals in 1H NMR around 1 and 2—3 ppm.
M. E. Jung, “Comprehensive Organic Synthesis”, M. B. Trost, Ed., Oxford, 1991, Vol. 4, Chapter 1.1.
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Nomura, R., Shintaku, Y. & Masuda, T. Novel Zwitterionic Alternating Copolymerization of Substituted Acetylenes with 2-Methyl-2-oxazoline. Polym J 32, 904–906 (2000). https://doi.org/10.1295/polymj.32.904
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DOI: https://doi.org/10.1295/polymj.32.904