Electrophilic activation of acetylene compounds in Brønsted superacids. Reactions of vinyl type cations

Published data on the reactions of vinyl type cations generated upon protonation of the carbon–carbon triple bond of acetylene compounds in proton-donor Bronsted superacids and conjugate Bronsted–Lewis systems: HSO3F, CF3SO3H, HSO3F–SbF5, CF3SO3H–SbF5, HF–SbF5, HBr–AlBr3, etc., are summarized. Charasteristics of vinyl type cations by physicochemical methods (NMR spectroscopy, X-ray diffraction analysis, IR spectroscopy) are given. The bibliography includes 88 references.