Gas chromatography of some nitrogen and sulfur heterocycles by means of silicone and Bentone (cas 1340-68-7)-silicone phases

Add time:09/01/2019    Source:sciencedirect.com

Gas chromatographic retention ratios are reported for 49 compounds in the thiophene, benzo(b)thiophene, pyridine, quinoline, isoquinoline, and thienopyridine ring systems, variously substituted with alkyl and halo groups. Stationary phases of Silicone DC 710 and of Bentone 34-Silicone DC 710 on Chromosorb were used at 128° and 180°. Retention ratio data for silicone are interpreted in terms of volatility of the substrate. Changes in retention ratios on going to Bentone-silicone are ascribed to adsorption to Lewis acidic sites (on the Bentone aluminosilicate sheets) by coordination of the heterocyclic nitrogen atom of the substrate molecule, particularly in the pyridine, quinoline, and thieno(2,3-b)-pyridine systems (studied most extensively).

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