Conclusions
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1.
The degree of substitution of the double bond in the bicyclo-(2,2,1)-heptene ring can be unambiguously established from a consideration of the Raman and IR absorption spectra in the region of 1570–1660 cm−1 [ν(C=C)] and 3000–3150 cm−1 [ν(C-H)].
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2.
The structure of the adducts of methyl-substituted cyclopentadienes in each of the cases investigated corresponds to the structure of the initial dienes (including samples of dienes far from the equilibrium state, i. e., the rate of interaction of substituted cyclopentadienes with an active dienophile (maleic anhydride) far exceeds the rate of the equilibrium transformations.
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The authors would like to thank L. M. Shulov for preparing the praseodymium filter.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1357–1363, August, 1965 Original article submitted June 19, 1963
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Sobolev, E.V., Mironov, V.A. & Fadeeva, T.M. Substituted cyclopentadienes and related compounds Communication 14. Peculiarities of the vibrational spectra of adducts of substituted cyclopentadienes with maleic anhydride. Russ Chem Bull 14, 1324–1328 (1965). https://doi.org/10.1007/BF00846186
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DOI: https://doi.org/10.1007/BF00846186