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Identification of conjugated fatty acids by gas chromatography‐mass spectrometry of 4‐methyl‐1,2,4‐triazoline‐3,5‐dione adducts
Author(s) -
Dobson Gary
Publication year - 1998
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-998-0024-9
Subject(s) - conjugated system , adduct , chemistry , mass spectrometry , cycloaddition , fatty acid , gas chromatography , organic chemistry , conjugated diene , diene , mass spectrum , gas chromatography–mass spectrometry , stereochemistry , chromatography , catalysis , polymer , natural rubber , monomer
4‐Methyl‐1,2,4‐triazoline‐3,5‐dione was reacted with conjugated fatty acid methyl esters to form Diels‐Alder cycloaddition products. The electron impact mass spectra of conjugated octadecadienoates and 9,11,13‐octadecatrienoate were simple and informative and allowed the positions of the double bonds to be determined. The dienes gave single adducts whereas the triene formed four products that corresponded to two stereoisomers of the adducts of the 9,11‐diene system and two of the 11,13‐diene system. The method can be used to complement other methods for identifying conjugated fatty acids.