Conclusions
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1.
Quantum-chemical calculations by the CNDO/BW and MINDO/2 methods have been carried out on certain modelβ-elimination reactions.
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2.
Study of various mechanisms involving ion solvation has shown that heterolytic C-H bond rupture is energetically favored over C-OR bond heterolysis, in solution but not in the gaseous phase.
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3.
In solutions with low dielectric constant (benzene, CH3COOH), ionic mechanisms can be realized only under the action of bases with PA's comparable to that of KOH.
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4.
Forβ-elimination reactions catalyzed by compounds such as CH3COOH and pyridine, we have proposed nonionic mechanisms based on proton transfer from theβ-carbon atom to the oxygen of the departing alcohol group.
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5.
It is proposed that the proton solvation energy in low-polarity solvents be calculated by making use of the electrostatic expression for the energy of solvation of the protonated solvent molecule.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2694–2702, December, 1977.
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Faustov, V.I., Fundyler, I.N., Esikova, I.A. et al. Catalysis in β-elimination reactions. 6. Quantum-chemical calculations on intermediate compounds with correction for solvation in slightly polar solvents. Russ Chem Bull 26, 2490–2497 (1977). https://doi.org/10.1007/BF00924550
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DOI: https://doi.org/10.1007/BF00924550