The chromatographic (GLC and silver ion TLC) properties of thirteen octadecadiynoic esters and the cis,cis-and trans,trans-dienoates derived from them are investigated. The possibility of predicting GEC behaviour (ECL) is discussed. We have already reported 1) the synthesis of several diunsaturated
Fatty acids, part 16. Thin layer and gas—liquid chromatographic properties of the cis and trans methyl octadecenoates and of some acetylenic esters
✍ Scribed by F.D. Gunstone; I.A. Ismail; M. Lie ken jie
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 372 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0009-3084
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✦ Synopsis
The chromatographic properties of the cis and trans methyl octadecenoates and of some C12 and Cls acetylenic esters on thin layers of silica impregnated with silver nitrate and on some GLC systems are reported. The possibility of identification and separation of these isomers is discussed.
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The N.M.R. spectra of the cis octadecenoic (A2-A17), octadecynoic (A2-A 5, Al°), and dodecynoic (A s\_ A ll) acids have been recorded. Those with unsaturation near the centre of the molecule cannot be distinguished from one another but the four isomers with unsaturation closest to the carboxyl group
All the cis octadecenoic esters have been converted to cyclopropane compounds by reaction with zinc-copper couple and di-iodomethane. Their gas-liquid chromatographic behaviour on four liquid phases is described. Six isomers (2,3-; 3,4-; 4,5-; 15,16-; 16,17 -; and 17,18 -) have distinctive nuclear m
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