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Intra- and intermolecular interactions in the first members of homologous series of carbonyl containing compounds in gas chromatography

✍ Scribed by Golovnya, R. V. ;Grigoryeva, D. N. ;Vasilyev, A. V.

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
425 KB
Volume
13
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

Variation of the values of free energy of sorption of the methylene unit has been studied in the homologous series of n‐alkyl methyl ketones, n‐alkyl butyl ketones, n‐alkyl acetates, and methyl esters of carboxylic acids, depending on the homologue number and the temperature of analysis. The experiment was carried out on a capillary column with a thick film of immobilized Silicone SE‐54 and on packed columns with OV‐210 and Silar‐10C. An intramolecular donor‐acceptor interaction between neighboring CH~3~ and CO groups is assumed to be the reason for anomalously high values of free energy of sorption of the first CH~2~ unit in the series: R~m~C(O)OCH~3~, R~m~C(O)CH~3~, and R~m~C(O)C~4~H~9~. The anomaly disappeared in stationary phases containing strongly electronegative CF~3~ and CN groups because of specific inter molecular interactions.

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