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Gutmann–Beckett method
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, the Gutmann–Beckett method is an experimental procedure used by chemists to assess the <a href="/facts/Lewis_acidity/qlLqRvg2">Lewis acidity</a> of <a href="/facts/Chemical_species/A8BxM3oW">molecular species</a>. Triethylphosphine oxide (Et3PO, TEPO) is used as a probe molecule and systems are evaluated by <a href="/facts/Phosphorus-31_nuclear_magnetic_resonance/0t8CaSjY">31P-NMR spectroscopy</a>. In 1975, Viktor Gutmann [de] used 31P-NMR spectroscopy to parameterize Lewis acidity of solvents by acceptor numbers (AN). In 1996, Michael A. Beckett recognised its more generally utility and adapted the procedure so that it could be easily applied to molecular species, when dissolved in weakly Lewis acidic solvents. The term <i>Gutmann–Beckett method</i> was first used in chemical literature in 2007. </p>