Cyclization of α-diselenocarbamato ketones [prepared from dichloromethylene(dimethyl)ammonium chloride with hydrogen selenide and triethylamine] in trifluoroacetic acid with sulphuric acid, afforded the cation (3) efficiently and safely without the need for carbon diselenide.
F. Wudl and D. Nalewajek, J. Chem. Soc., Chem. Commun., 1980, 866a DOI: 10.1039/C3980000866A
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