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Abstract
Two series of new compounds, i.e., α-arylazophenacyltriphenylphosphonium bromides 4 and the corresponding ylides 5 were prepared. Both 4 and 5 were found unreactive in Wittig-like reactions, possibly due to the high acidity of 4 and the low basicity of 5. The pKa values of 4 were determined in 80% (vol.) ethanol-water and were found to be correlated by the Hammett equation.