ortho-Borylated trifluoroacetanilides: synthesis and fluoride ion binding properties
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2006 Taylor and Francis. The o-(pinacolboryl)trifluoroacetanilide (1) has been synthesized and structurally characterized. As indicated by NMR spectroscopy, this novel derivative reacts with fluoride to afford the corresponding fluoroborate derivative [1-F]- in which the boron-bound fluorine atom forms a hydrogen bond with the proton of the trifluoroacetamide functionality. Compound 1 reacts with KHF2 to afford the corresponding trifluoroborate derivative which has been isolated as a dibenzo-18-crown-6 potassium salt (2). The crystal structure and the 1H NMR spectrum of this salt confirm the presence of a B-F H-N hydrogen bond.