Gutmann–Beckett method

The Gutmann–Beckett method is an experimental procedure used by chemists to assess a Viktor Gutmann] used ^{31P-NMR spectroscopy to parameterize Lewis acidity of solvents by acceptor numbers AN. In 1996, Michael A. Beckett recognised its more generally advantage together with adapted the procedure so that it could be easily applied to molecular species, when dissolved in weakly Lewis acidic solvents. The term Gutmann–Beckett method was number one used in chemical literature in 2007.}

Application to boranes

Boron trihalides are archetypal Lewis acids and hit AN values between 89 BF₃ and 115 BI₃. The Gutmann–Beckett method has been applied to fluoroarylboranes such(a) as BC₆F₅₃ AN 82, and borenium cations, and its applications to these and various other boron compounds has been reviewed.