pKa values have for the first time been measured for common phosphonium ions, including butyl-, allyl-, prop-2-ynyl- and benzyl-triphenylphosphonium, by comparison through a linear Brønsted plot of their rates of proton transfer to an electrogenerated base with those involving carbon acids of known acidity.
S. Ling-Chung, K. D. Sales and J. H. P. Utley, J. Chem. Soc., Chem. Commun., 1990, 662 DOI: 10.1039/C39900000662
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