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- W4235346124 abstract "This paper is concerned with the evaluation of old and new evidence concerning the mechanism of polymerisation of 1,3-dioxacycloalkanes (DCA). The most recent evidence on polymerisations initiated by perchloric acid shows that in strictly anhydrous systems the propagating species is a sec. oxonium ion, so that under these conditions the propagation must be by the ring-expansion mechanism. In the presence of water, tert. oxonium ions are formed. A comparison of the polymerisation behaviour of DCA and tetrahydrofuran (THF) leads to the conclusion that the propagation mechanisms must be different. By comparing the activation entropy of DCA polymerisations initiated by organic cations on the one hand with that of DCA polymerisations initiated by perchloric acid, and on the other with that of the polymerisation of THF, it appears that the polymerisations of DCA initiated by organic cations are most probably also propagated by the ring-expansion mechanism. Some mechanistic suggestions by Penczek and by Okada are scrutinized and the status of the oxy-carbenium ion as a propagating species is analysed." @default.
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- W4235346124 date "1977-01-01" @default.
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- W4235346124 title "SOME ASPECTS OF THE POLYMERISATION OF 1,3-DIOXACYCLOALKANES" @default.
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- W4235346124 doi "https://doi.org/10.1016/b978-0-08-021367-5.50009-2" @default.
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