The regularities of the gas-chromatographic behavior of methyl-substitutedN-alkylpiperidines

The gas-chromatographic behavior of 2-, 3-, 4-methyl- and 2,6-dimethylpiperidine bases on glass capillary columns with OV-101/KF and PEG-40M/KF at 110 °C has been studied. The contribution of a methyl group to the total molar free energy of Sorption of nonalkylated piperidine bases depends on its position in the piperidine cycle and is the least for positions 2 and 6. The variation in the retention indices of homologousN-alkylpiperidines (C1-C7) is given by a universal type of equation.