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Correlation of the kred values for para-substituted N,N'-dibenzyl-1,4-diaminobutanes as substrates for PAO with structural and electronic properties of the substituent: (A) correlation of the kred value at pH 6.6 with the van der Waals volume (VW), (B) correlation of the kred value at pH 8.6 with VW, (C) correlation of the kred value at pH 8.6 with σ, and (D) correlation of the kred value at pH 8.6 with σ after correction of the kred value for the contribution of Vw.
