SCHEDULED MAINTENANCE
γ-Chalcogen-substituted prop-2-ynyl cations are generated by the reactions of diethyl acetals 1 and 2 with BF3–Et2O and react with various mild nucleophiles without isomerisation to allenyl cations to afford the prop-2-ynylated products 3a–e and 5a–c in good yields.
M. Yoshimatsu, H. Shimizu and T. Kataoka, J. Chem. Soc., Chem. Commun., 1995, 149 DOI: 10.1039/C39950000149
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