A versatile synthetic route has been developed to access strongly Lewis acidic borenium cations (and heavier group 13 analogues) featuring a pendant weakly-coordinating borate function. The hydrocarbon-soluble borenium/borate zwitterion is more strongly Lewis acidic than B(C6F5)3, despite featuring a pendant (non-fluorinated) aryl group and two flanking N-donors.
J. A. B. Abdalla, R. C. Tirfoin, H. Niu and S. Aldridge, Chem. Commun., 2017, 53, 5981 DOI: 10.1039/C7CC03121A
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