GAS-CHROMATOGRAPHIC DETERMINATION OF THE FREE-ENERGY OF SORPTION OF METHYLENE UNITS OF N-ALKYLSUBSTITUTED 6-MEMBERED CYCLIC AMINES

The free energy of sorption of methylene units, Delta G(CH2), for the homologous series of N-alkylsubstituted morpholines, thiomorpholines, piperidines and 2-methyl-, 3-methyl-, 4-methyl- and 2,6-dimethylpiperi dines was determined. It was shown that the dependence of these values on the number of CH2 units in the carbon chain is not linear. Univers al equations for calculating the values of the energy contribution dep ending on the number of CH2 units in the carbon chain were obtained. A bnormally high values of free energy of sorption of the first CH2 unit were found in ah series studied and reasons for the anomaly are discu ssed.