Electron impact mass spectra of the oxazoline derivatives of some conjugated diene and triene C₁₈ fatty acids

Abstract

Abstract The location of the double‐bond systems of some conjugated diene and triene C 18 fatty acids (C18∶2[9,11], C18∶2[10,12], C18∶3[9,11,13] and C18∶3[10,12,14]) derived from alkaline isomerization has been determined by gas chromatography/mass spectroscopy analysis of their 4,4‐dimethyloxazoline derivatives. The positions of the double bonds were indicated by a characteristic mass separation of 12 atomic mass units for each olefinic bond. Furthermore, the structure assignments were supported by the presence of prominent formal allylic cleavage peaks.