Abstract
Cyclic organic peroxides are a broad and highly sought-after class of peroxide compounds that present high reactivity and even explosive character. The unusually high reactivity of these peroxides can generally be attributed to the rupture of O–O bonds. Cyclic diperoxides are a very interesting series of substituted compounds in which tetroxane is the most prominent member. Gas-phase thermolysis of the simplest substituted member of the series [3-methyl-1,2,4,5-tetroxane or methylformaldehyde diperoxide (MFDP)] has been observed to yield one acetaldehyde, one formaldehyde, and one oxygen molecule as reaction products. DFT at the 6-311 + G** level of theory using the BHANDHLYP correlation–exchange functional was applied via the Gaussian09 program to calculate the critical points of the potential energy surface (PES) of this reaction. Equatorial and axial isomers were studied. The singlet state PES of MFDP was calculated, and an open diradical structure was found to be the first intermediate in a stepwise reaction. Two PESs were subsequently obtained: singlet state (S) and triplet state (T) PESs. After that, two alternative stepwise reactions were found to be possible: 1) one in which either an acetaldehyde, or 2) formaldehyde molecule is initially formed. For second one, exothermic reactions were observed for both the S and T PESs. The reaction products include a oxygen molecule in either S or T state, with the T reaction being the most exothermic. When calculations were performed at the CASSCF(10,10)/6-311 + G** level, spin–orbit coupling permitted S to T crossing at the open diradical intermediate stage, a non-adiabatic reaction was observed, and lower activation energies and higher exothermicity were generally seen for the T PES than for the S PES. These results were compared with the corresponding results for tetroxane. The spin–orbit coupling of MFDP and tetroxane yielded identical values, so it appears that the methyl substituent does not have any effect on this coupling.
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Figure S1
Reaction profile of pathway S-Ia in Scheme 1 for the axial isomer. Activation energies are calculated from S-c or S-o. Energies are in kcal/mol, and bond lengths are in Å. Spin densities are shown next to the respective atoms in parentheses. White, gray, and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 294 kb)
Figure S2
Reaction profile of pathway S-Ib in Scheme 1 for the axial isomer. Activation energies are calculated from S-c or S-o. Energies are in kcal/mol, and bond lengths are in Å. Spin densities are shown next to the respective atoms in parentheses. White, gray, and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 283 kb)
Figure S3
Reaction profile of the second part of pathway S-Ia in Scheme 1 for the axial isomer. Energies are in kcal/mol, and bond lengths are in Å. Spin densities are shown next to the respective atoms in parentheses. White, gray and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 102 kb)
Figure S4
Reaction profile of pathway S-II in Scheme 1 for the axial isomer. Energies are in kcal/mol, and bond lengths are in Å. White, gray, and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 115 kb)
Figure S5
Reaction profile of the first step of pathway T-Ia in Scheme 2 for the axial isomer. Activation energies are calculated from T-o. Energies are in kcal/mol, and bond lengths are in Å. Spin densities are shown next to the respective atoms in parentheses. White, gray, and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 138 kb)
Figure S6
Reaction profile of the first step of pathway T-Ib in Scheme 2 for the axial isomer. Activation energies are calculated from T-o. Energies are in kcal/mol, and bond lengths are in Å. Spin densities are shown next to the respective atoms in parentheses. White, gray, and red spheres indicate hydrogen, carbon, and oxygen atoms, respectively. (DOCX 134 kb)
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Profeta, M.I., Romero, J.M., Jorge, N.L. et al. Theoretical study of the gas-phase thermolysis of 3-methyl-1,2,4,5-tetroxane. J Mol Model 20, 2224 (2014). https://doi.org/10.1007/s00894-014-2224-6
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DOI: https://doi.org/10.1007/s00894-014-2224-6