4 years ago

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids
Agnieszka Adamczyk-Woźniak, Tadeusz Ossowski, Amanda Kulpa, Dorota Zarzeczańska, Andrzej Sporzyński
The acidity constants and hydrolytic stability of all isomers of fluoro-substituted phenylboronic acids (F1–F5) have been determined by both spectrophotometric and potentiometric methods. The introduction of fluorine into the aromatic ring enhances the Lewis acidity of boronic acids, depending on the position and number of fluorine substituents. Results of both methods show good agreement in most of the cases. To explain the observed discrepancies for several compounds, stability studies have been carried out by spectrophotometry. The observed change of maximum absorption intensity is dependent on pH and temperature, but there is no simple correlation between the pKa and the decomposition rate. The less-stable compounds are those with two fluorine atoms at the ortho positions. It was found that the pKa values for mono- and difluoro-substituted boronic acids show good linear correlation with the values for the corresponding benzoic acids.Introduction of fluorine into an aromatic ring of phenylboronic acid enhances its Lewis acidity, but makes it prone to the hydrodeboronation reaction. The pKa values obtained by potentiometric and spectrophotometric methods are in good agreement.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700546

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