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- W2000576244 abstract "The potential energy surfaces for the reaction of furanyl and oxazolyl radicals with O2 have been examined using the B3LYP method. The initial production of the arylperoxy radical followed by either simple decomposition or rearrangement to yield several intermediates (aryloxy, dioxiranylaryl, or dioxetanylaryl radicals) has been explored. Transition state structures for most of the steps are presented as well as relative free energies over a range of temperatures from 298 to 2000 K. The energetics of the analogous intermediates for the reaction of O2 and other five-membered heterocyclic radicals derived from pyrrole and thiophene are also provided. The loss of an O atom is generally the most accessible and energetically favored pathway of decomposition at all temperatures. Dioxiranyl formation is favored over O2 loss at temperatures ≤500 K and favored in the same temperature range over O atom loss in several cases. Dioxetanyl formation incurs the greatest barrier to formation, and direct routes are not available in every molecule surveyed. However, in some cases the dioxetane radicals transform rapidly into very stable species." @default.
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- W2000576244 date "2000-06-14" @default.
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- W2000576244 title "Rearrangement Pathways of Arylperoxy Radicals. 2. Five-Membered Heterocycles" @default.
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- W2000576244 doi "https://doi.org/10.1021/jp0012202" @default.
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