Conclusions
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1.
Treatment of α-piperidinocrotonaldehyde with hydrogen chloride or trifluoroacetic acid gave the corresponding enammonium salt. Reaction of the aldehyde with acetic acid caused dissociation and polymerization.
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2.
Hydration of the double bond of a-piperidinocrotonaldehyde in acid medium proceeded according to the Markownikoff rule to yield the piperidine salt and ethylglyoxal.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2471–2474, November, 1986.
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Keiko, N.A., Rulev, A.Y., Khalikhman, I.D. et al. Protonation and hydrolysis of α-piperidinocrotonaldehyde. Russ Chem Bull 35, 2260–2262 (1986). https://doi.org/10.1007/BF00953335
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DOI: https://doi.org/10.1007/BF00953335