Gutmann–Beckett method
Technique for measuring a molecule's Lewis acidity / From Wikipedia, the free encyclopedia
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In chemistry, the Gutmann–Beckett method is an experimental procedure used by chemists to assess the Lewis acidity of molecular species. Triethylphosphine oxide (Et3PO, TEPO) is used as a probe molecule and systems are evaluated by 31P-NMR spectroscopy. In 1975, Viktor Gutmann [de] used 31P-NMR spectroscopy to parameterize Lewis acidity of solvents by acceptor numbers (AN).[1] 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.[2] The term Gutmann–Beckett method was first used in chemical literature in 2007.[3]