Structural regularities governing sorption and gas chromatographic retention of aromatic nitrogen-containing heterocyclic compounds
1999
The regularities governing differences in the gas chromatographic retention indices of aromatic nitrogen-containing heterocyclic compounds were studied during gas chromatographic analysis on a nonpolar capillary column. The retention indices of pyrrole, pyrazole, imidazole, 1,2,4-triazole, oxazole, thiazole, isoxazole, pyridine, pyridazine, pyrimidine, pyrazine, ands-triazine and their alkyl derivatives depend on the number, nature, and arrangement of heteroatoms and alkyl groups in the cycles. The majority of homologous series ofn-alkyl-substituted azoles and azines andn-alkylbenzenes is characterized by anomalously high differences between the retnetion indices of ethyl and methyl homologs. A scheme of calculation of retention indices of aromatic heterocyclic compounds from increments of heteroatoms was proposed.
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