According to the nature of their substituents hydroxy-ammonium salts, R1C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CCH(NMe3+I–)CR2R3-OH, when treated with a weak base in aqueous solution, are either cleaved into a carbonyl compound and a quaternary prop-2-ynylic ammonium compound, or cyclize to form an oxiran or a furan.
R. Epsztein and N. Le Goff, J. Chem. Soc., Chem. Commun., 1977, 679 DOI: 10.1039/C39770000679
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