Abstract
The effect of steric and electronic factors on the stability of the molecular ion and the probability of its isomerization in the mass spectra of 3-aryl-5-methylisoxazole-4-carboxylic acids were examined. The relationship between the resistance of the molecules to electron impact and the intensity of disintegration of the isoxazole ring was demonstrated. The formation of the primary rearrangement ions is discussed on the basis of the mass spectra of labeled compounds and the substituent effect.
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R. A. Khmel'nitskii, K. K. Zhigulev, and S. D. Sokolov, Izv. Timiryaz. Sel'skokhoz. Akad. No. 1, 197 (1971).
K. K. Zhigulev, R. A. Khmel'nitskii, and S. D. Sokolov, Khim. Geterotsikl. Soedin., 737 (1971).
N. Turro, Molecular Photochemistry, Benjamin, 1965.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 889–892, July, 1972.
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Zhigulev, K.K., Khmel 'nitskii, R.A., Panina, M.A. et al. Rearrangement processes and stability of molecular ions in the mass spectra of 3-aryl-5-methylisoxazole-4-carboxylic acids. Chem Heterocycl Compd 8, 806–809 (1972). https://doi.org/10.1007/BF00475207
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DOI: https://doi.org/10.1007/BF00475207