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The ESR study of the structure and reactivity of α-ketoradicals, derivatives of (CF3)3CC(O)C(O)CF3

  • Physical Chemistry
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Abstract

The structure and reactivity of α-ketoradicals, derivatives of (CF3)3CC(O)C(O)CF3 (1), were studied by ESR spectroscopy. The photoreduction of α-diketone1 in a solution of cyclohexane in perfluorodipentyl ether results in the formation of radicals of two types, (CF3)3CC(2)(O(4))·C(3)(O(6)H)CF3 (1a) and (CF3)3C·C(OH)C(O)CF3 (1b) in a ∼40∶1 ratio. The degree of delocalization of the spin density in two conformers of radical1a was calculated by the MNDO/PM3 method in the UHF approximation. It was established that radicals1a and1b are capable of reversible dimerization. The rate constant of dimerization and the enthalpy of the radical—dimer equilibrium were measured for radical1a. A decrease in the rate of dimerization of radical1a upon addition of complexing solvents ((CF3)3COH andp-CF3C6H4CF3) was found. The influence of the solvents on the rate of dimerization was also detected for α-ketoradical (CF3)3CC(O)·C(OSiMe2Ph)CF3 (1c).

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References

  1. A. R. Forrester, J. M. Hay, and R. H. Thomson,Organic Chemistry of Stable Free Radicals, Academic Press, London-New York, 1967, 405 pp.

    Google Scholar 

  2. E. N. Shaposhnikova, E. A. Avetisyan, S. R. Sterlin, N. N. Bubnov, S. P. Solodovnikov, A. L. Chistyakov, I. V. Stankevich, and B. L. Tumanskii,Izv. Akad. Nauk, Ser. Khim., 1997, 1954 [Russ. Chem. Bull., 1997,46, 1851 (Engl. Transl.)].

  3. D. M. Camaioni, H. F. Walter, J. E. Jordan, and D. W. Pratt,J. Am. Chem. Soc., 1973,95, 7978.

    Article  CAS  Google Scholar 

  4. S. K. Wong, W. Sytnyk, and J. K. S. Wan,Can. J. Chem., 1972,50, 3052.

    Article  CAS  Google Scholar 

  5. M. A. Kurykin, L. S. German, Yu. N. Studnev, and A. V. Fokin,Izv. Akad. Nauk SSSR, Ser. Khim., 1980, 1679 [Bull. Acad. Sci. USSR, Div. Chem. Sci., 1980,29 (Engl. Transl.)].

    Google Scholar 

  6. P. J. Krusic, K. S. Chen, P. Meakin, and J. K. Kochi,J. Phys. Chem., 1974,78, 2036.

    Article  CAS  Google Scholar 

  7. J. J. P. Stewart,J. Comput. Chem., 1989,10, 209.

    Article  CAS  Google Scholar 

  8. B. L. Tumanskii, N. N. Bubnov, V. R. Polishchuk, and S. P. Solodovnikov,Izv. Akad. Nauk SSSR, Ser. Khim., 1981, 2222 [Bull. Acad. Sci. USSR, Div. Chem. Sci., 1981,30, 1821 (Engl. Transl.)].

    Google Scholar 

  9. A. L. Buchachenko and A. M. Vasserman,Stabil'nye radikaly [Stable Radicals], Khimiya, Moscow, 1973 (in Russian).

    Google Scholar 

  10. J. E. Wertz and J. R. Bolton.Electron Spin Resonance. Elementary Theory and Practical Applications, McGraw Hill, New York, 1972.

    Google Scholar 

  11. B. L. Tumanskii, S. P. Solodovnikov, N. N. Bubnov, Yu. V. Zeifman, E. V. Balagurova, V. N. Lebedev, and L. I. Zakharkin,Izv. Akad. Nauk SSSR, Ser. Khim., 1989, 1139 [Bull. Acad. Sci. USSR, Div. Chem. Sci., 1989,38, 1034 (Engl. Transl.)].

    Google Scholar 

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Authors and Affiliations

  1. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Varilova, 117813, Moscow, Russian Federation

    E. N. Shaposhnikova, S. R. Sterlin, S. P. Solodovnikov, N. N. Bubnov, A. I. Chernyavskii, A. L. Chistyakov, I. V. Stankevich & B. L. Tumanskii

Authors
  1. E. N. Shaposhnikova
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  2. S. R. Sterlin
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  3. S. P. Solodovnikov
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  4. N. N. Bubnov
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  5. A. I. Chernyavskii
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  6. A. L. Chistyakov
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  7. I. V. Stankevich
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  8. B. L. Tumanskii
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Additional information

Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 62–67, January, 1998.

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Shaposhnikova, E.N., Sterlin, S.R., Solodovnikov, S.P. et al. The ESR study of the structure and reactivity of α-ketoradicals, derivatives of (CF3)3CC(O)C(O)CF3 . Russ Chem Bull 47, 60–65 (1998). https://doi.org/10.1007/BF02495510

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  • DOI: https://doi.org/10.1007/BF02495510

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