A 19F NMR spectroscopic probe, p-fluorobenzonitrile, is used to evaluate the relative Lewis acidity of boranes. The resulting scale is compared with the Gutmann–Beckett method which uses triethylphosphine oxide as a 31P NMR probe and both are compared to computed fluoride affinities.
S. Ranasinghe, Y. Li, M. E. Andrews, M. O. Akram, R. A. Thornton and C. D. Martin, Chem. Commun., 2025, 61, 10182 DOI: 10.1039/D5CC02299A
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