Royal Society of Chemistry, Catalysis Science & Technology, 5(7), p. 1045-1049
DOI: 10.1039/c7cy00106a
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Ionic liquids with Lewis superacidic borenium cations were used as catalysts in solvent-less Diels–Alder cycloaddition. The extremely high catalytic activity correlated with the Lewis acidity, expressed as the Gutmann acceptor number.