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NMR spectroscopy and X\u2010ray diffraction of the Lewis adducts of these non\u2010planar boron Lewis acids with weak Lewis base revealed particularly strong covalent bond formation. The first Lewis adduct of a trivalent boron compounds with the Tf\n                    <jats:sub>2<\/jats:sub>\n                    N\n                    <jats:sup>\u2212<\/jats:sup>\n                    anion illustrates the unrivaled Lewis acidity of these species. Increasing the pyramidalization of the boron center and using a cationic phosphonium linker resulted in an exceptional enhancement of Lewis acidity. 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