Abstract
1. Substitution of an oxygen atom by a sulfur in aliphatic and cyclic ethers and aromatic heterocycles brings about a uniform increase in the energy of dispersive interaction, this being the thermodynamic basis for analogies in the GC behavior of S- and O-containing compounds. 2. A simple method for calculating differences of differential molar free energies of solution δ(ΔG)ij from retention indices has been proposed and used to give a quantitative description of the differences in GC behavior of the compounds under discussion here.
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