Studies on trimethylsilyl derivatives of 1‐alk‐1‐enyl‐2‐acyl glycerols by gas‐liquid chromatography mass spectrometry

Trimethylsilyl derivatives of 1‐hexadec‐1‐enyl‐2‐decanoyl and ‐2‐octadecenoylglycerols and 1‐octadec‐1‐enyl‐2‐decanoyl and ‐2‐octadecenoylgycerols were subjected to analysis by a gas chromatograph mass spectrometer system. The characteristic ions are as follows: (1) ions at [M – 15] + and [M – 90] + are observed, 2 or 16 mass units less than those of the corresponding 1‐alkyl‐2‐acyl or 1,2‐diacyl derivatives; (2) the base peak is m / e 129; (3) the ion at [M – R 1 CH CHO] + or [R 2 COO + 130] + is present in high abundance; (4) ions at m / e 311 and 339, characteristic of trimethylsilyl derivatives of 1‐hexadec‐1‐enyl and 1‐octadec‐1‐enylglycerols, are due to [(R 1 CH = CHO–1) + 73] + , also confirmed from studies on the perdeuteriotrimethylsilyl derivatives; (5) several ions based on one acyl group, [R 2 CO] + , [R 2 CO + 74] + and [R 2 COO + 74] + are also observed.