Electrophilic activation of acetylene compounds in Brønsted superacids. Reactions of vinylic cations

The review generalizes the published data on the reactions of vinylic cations generated upon alkyne protonation at the triple bond in proton-donor Br${\oslash}$nsted superacids and Børonsted–Lewis conjugated systems: HSO₃F₅, CF₃SO₃H–SbF₅, HF–SbF₅, HBr–AlBr₃ and so on. Characteristics of vinylic cations obtained by physicochemical methods (NMR spectroscopy, X-ray diffraction, IR spectroscopy) are presented. Bibliography — 88 references.