Dynamic Ion Speciation during the Hydrolysis of Aryltrifluoroborates
CHEMISTRY-A EUROPEAN JOURNAL(2021)
Abstract
Organotrifluoroborates serve as coupling partners during transmetalation in the Suzuki-Miyaura reaction but require hydrolysis prior to the coupling reaction. Their anionic nature allows study of their hydrolysis by electrospray ionization mass spectrometry (ESI-MS) through real-time monitoring, complemented by pH analysis. The induction period varied according to the borates employed, and a dynamic series of equilibria for numerous ions was observed during hydrolysis. We found that the induction periods and reaction rates were sensitive to the R group of the borates, the shape of the reaction vessel, and stir rate.
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Key words
aryltrifluoroborates,hydrolysis,ion speciation,pH analysis,real-time monitoring
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