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ESR spectroscopic investigation of steric and polar factors in the addition of radicals to unsaturated compounds

  • Organic Chemistry
  • Reactivity
  • Published:
Bulletin of the Russian Academy of Sciences, Division of chemical science Aims and scope

Abstract

The rate constants of the addition of CCl3CH2ĊClCH3(R6) radicals to α-methyl-styrene, styrene, methyl methacrylate, methyl acrylate, and acrylonitrile and of CCl3CH2Ċ(CH3)2(R7) radicals to styrene, methyl acrylate, and acrylonitrile were determined by ESR spectroscopy. It was shown that the radicals R6 and R7 possess approximately equal reactivity in addition to unsaturated compounds, despite the difference in the donor-acceptor properties of the substituents at the vinyl group. In a comparison of the reactivity of radicals R6 and R7 with the reactivity of radicals CCl3CH2ĊH2(R1), CCl3CH2ĊHCH3(R3), CCl3CH2ĊHCl(R4), and ClCH2CH2ĊCl2(R5) [1] in addition reactions, it was shown that polar and steric effects of the substituents situated in the α-position to the radical site of the above-mentioned radicals, as well as the donor-acceptor properties of the substituents at the vinyl group in the unsaturated compounds, lead to appreciable changes in reactivity.

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Authors
  1. R. G. Gasanov
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  2. A. L. Tumanskaya
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  3. L. V. Il'inskaya
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Additional information

A. N. Nesmeyanov Institute of Heteroorganic Compounds, Russian Academy of Sciences, 117813 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 1, pp. 136–141, January, 1992.

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Gasanov, R.G., Tumanskaya, A.L. & Il'inskaya, L.V. ESR spectroscopic investigation of steric and polar factors in the addition of radicals to unsaturated compounds. Russ Chem Bull 41, 107–111 (1992). https://doi.org/10.1007/BF00863922

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  • DOI: https://doi.org/10.1007/BF00863922

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