Abstract
In a study of the mass spectra of methoxy-substituted 4-aminopyrimidines it has been shown that in the molecular ion the positive charge is predominantly concentrated on the oxygen atom of the methoxy group, which explains the appearance of the fragmentary ions (M-H)+ and (M-CH2O)+. In contrast to the halopyrimidines, the molecular ion does not exist in the imine form, which is characteristic only for the fragmentary ions (M-CH2O)+.
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R. A. Khmel'nitskii, E. A. Kunina, A. B. Belikov, and Yu. P. Shvachkin, Izv. TSKhA, No. 2, 231 (1971).
R. A. Khmel'nitskii, N. A. Klyuev, E. A. Kunina, and A. A. Kropacheva, Khim. Geterotsikl. Soedin., 1689 (1973).
C. S. Barnes and I. L. Occolowitz, Austral. J. Chem., 16, 219 (1963).
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Here and below, M is the mass of the molecular ion.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 127–130, January, 1974.
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Khmel'nitskii, R.A., Klyuev, N.A., Kunina, E.A. et al. Mass spectra of methoxy-substituted 4-aminopyrimidines. Chem Heterocycl Compd 10, 113–116 (1974). https://doi.org/10.1007/BF00475925
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DOI: https://doi.org/10.1007/BF00475925