The pKa values of 20 acidic hydrocarbons are satisfactorily described by the (π+σ) electronic energy change. The conventional π-energy change has been shown to be less reliable. The importance of other contributing factors is discussed.
D. H. Lo and M. A. Whitehead, J. Chem. Soc. A, 1969, 1513 DOI: 10.1039/J19690001513
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