Conclusions
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1.
The direct observation of the protonation of an imine by the hydronium ion in the example of the N-methylethylenimine (MEI)-H3O+·Cl− system has been carried out.
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2.
It has been shown experimentally that the protonation of a hydrated imine also takes place for MEI·H2O despite the fact that the lone pair of the N atom is shielded by an H bond, i.e., the water participating in the formation of the hydrate does not prevent protonation.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 106–110, January, 1981.
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Lebedeva, T.L., Avakyan, V.G. & Zhuk, D.S. IR-spectroscopic investigation of the protonation of N-methylethylenimine by the H3O+ cation with the aid of low-temperature matrix isolation. Russ Chem Bull 30, 85–88 (1981). https://doi.org/10.1007/BF00962259
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DOI: https://doi.org/10.1007/BF00962259