Abstract
Thermal transformations of vinylcyclopropane radical cations (VCP.+) in X-ray-irradiated frozen Freon matrices (CFCl2CF2Cl and CFCl3) were studied by ESR; radical processes involving VCP.+ in solid VCP were simulated.Gauche- andanti-VCP .+ were found to be the primary radical cations, however, the former, unlike the latter, is stable only under “gas-phase” conditions. The thermodynamic equilibrium betweenanti-VCP.+ and its less stable distonic form,dist(90,0)-C 5H8 .+, is established in frozen Freon matrices and the VCP host matrix; the structure of dist(90,0)****-C 5H8 .+ is stabilized by a molecule ofanti-VCP. In CFC3, along with dist(90,0)-C5H8 .+,π-dimeric resonance [anti-VCP]2 .+ complex was detected. A general scheme of the transformations of VCP.+ in the solid phase has been proposed.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 11–21, January, 1994.
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Shchapin, I.Y., Fel'dman, V.I., Belevskii, V.N. et al. ESR and quantum chemical studies of the structures and thermal transformations of the radical cations of vinylcyclopropane in irradiated frozen Freon matrices. Simulation of radical processes in solids. Russ Chem Bull 43, 1–12 (1994). https://doi.org/10.1007/BF00699126
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DOI: https://doi.org/10.1007/BF00699126