In our previous work, limiting separation factors K i ∞ of 2-furanaldehyde, benzaldehyde, phenylethanal, and 2-phenylethanol in water were determined using a recirculating still of the Gillespie type. Limiting activity coefficients γ i ∞ were calculated out of the limiting separation factors K i ∞ in the previous work, too. As it was announced in those papers, a revised calculation of the limiting activity coefficient γ ∞ data was performed in this work. For this work, vapor pressure measurements were performed with the transpiration method. The results of these measurements are given here together with the derived enthalpies of vaporization of the investigated components and their formerly calculated and recalculated limiting activity coefficients in water at 100°C.