Il. Zhuravleva et al., GAS-CHROMATOGRAPHIC DETERMINATION OF THE FREE-ENERGY OF SORPTION OF METHYLENE UNITS OF N-ALKYLSUBSTITUTED 6-MEMBERED CYCLIC AMINES, Russian chemical bulletin, 43(3), 1994, pp. 395-397
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.