Mass spectra of the picolinyl ester derivatives of some conjugated diacetylenic fatty acids

✍ Scribed by M.S.F. Lie Ken Jie; Y.K. Cheung; S.H. Chau; W.W. Christie; E.Y. Brechany

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 239 KB
• Volume: 63
• Category: Article
• ISSN: 0009-3084
• DOI: 10.1016/0009-3084(92)90023-i

✦ Synopsis

The electron impact (EI) mass spectral analysis of the picolinyl esters of nine positional isomers of conjugated diacetylenic fatty acids showed prominent M + and [M-l] + peaks. In all cases there was a regular series of ions 14 amu apart in the high molecular weight range until the triple bond system was reached with cleavage starting from the a-methyl end of the alkyl chain. Ions formed by cleavage adjacent to the triple bonds on the carboxyl side of the molecule were insignificant. This technique permitted the position of the conjugated diacetylenic bonds to be determined for each isomer or homologue under investigation.