Abstract
The gas—liquid chromatographic (GLC) behaviour of the pentafluorobenzyl and methyl esters of ten structurally related chlorophenoxyalkyl acids was studied by comparing their retention indices on nine frequently used liquid phases with increasing McReynolds constants. The resolution of each liquid phase is different for the pentafluorobenzyl and the methyl ester derivatives. However, using an apolar and a polar phase, a graph of the retention index ( I) on the polar phase against the difference in retention indices (Δ I) between the polar and the non-polar phase shows a good correlation between structure and retention in gas—liquid chromatography. The graphs constructed for the pentafluorobenzyl and for the methyl esters have the same structure—retention correlations.
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