Formation of the intermediate cyclic six-membered oxonium ion in the cationic polymerization of β-propiolactone initiated with CH3CO⊕SbF |
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Authors: | Stanis aw S omkowski,Ryszard Szyma ski,Andrzej Hofman |
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Affiliation: | Stanisław Słomkowski,Ryszard Szymański,Andrzej Hofman |
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Abstract: | Analysis of the 1H NMR spectra of documentclass{article}pagestyle{empty}begin{document}$ {rm CH}_{rm 3} mathop {rm C}limits^ oplus {rm OSbF}_{rm 6}^ ominus $end{document} /β-propiolactone and of the model systems documentclass{article}pagestyle{empty}begin{document}$ {rm CH}_{rm 3} mathop {rm C}limits^ oplus {rm OSbF}_{rm 6}^ ominus $end{document} /(CH3)2O and documentclass{article}pagestyle{empty}begin{document}$ {rm CH}_{rm 3} mathop {rm C}limits^ oplus {rm OSbF}_{rm 6}^ ominus $end{document} /CH3COOCH3 in liquid SO2 in the temperature region ?70 to ?20°C revealed that the reaction of the acetylium cation with β-propiolactone leads to the cyclic six-membered oxonium ion 4 , participating as an intermediate in the initial stage of polymerization. |
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