Ideal gas thermodynamic properties (ΔHf°298, S°298, and Cp(T), 300 ≤ T/K ≤ 1500) for 34 cyclic oxygenated hydrocarbons are calculated using the PM3 method, including 12 species on which data are not previously reported. Enthalpies of formation obtained using PM3 are further corrected by −1.642 + 0.882ΔHf°298,PM3, which is obtained by comparison to experimentally-determined ΔHf°298 of 10 cyclic oxygenated hydrocarbon molecules. Enthalpies of formation (ΔHf°298, in kcal mol-1) and entropy (S°298, in cal mol-1 K-1) for 12 species are calculated as follows: −57.24 and 64.10 for 1,3-dioxetane, 25.08 and 61.36 for dioxirene, −4.62 and 68.16 for 1,2-dioxolene, −49.03 and 66.11 for 1,3-dioxolene, 16.72 and 68.21 for 1,2,3-trioxolene, −32.96 and 73.79 for 1,2-dioxane, −11.45 and 75.07 for 3,4-dihydro-1,2-dioxin, −57.44 and 72.62 for 2,4-dihydro-1,3-dioxin, −59.82 and 73.30 for 1,2,4-trioxane, −13.05 and 74.80 for 1,2,3-trioxane, −38.08 and 74.68 for 1,2,4-trioxene, and 9.14 and 74.68 for 1,2,3-trioxane, respectiv...
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