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Tetramethylsilane chemical ionization mass spectrometry of some isomeric unsaturated dicarboxylic acids and esterst

โœ Scribed by R. Srinivas; M. Vairamani; K. V. Siva Kumar; M. S. Rajeev; G. K. Viswanadha Rao

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
338 KB
Volume
27
Category
Article
ISSN
1076-5174

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โœฆ Synopsis

The tetramethylsilane (TMS) chemical ionization (CI) mass spectra of some geometrical isomers of unsaturated dicarboxylic acids, esters and isomeric phthalic acids reveal explicit differences. The (@-acids show an abundant [ M + 73 -CH,I + ion whereas the (a-acids exhibit a strong [ M + 73 -H,OJ + ion in their TMS CI spectra. The loss of CH, from the adduct of fumaric acid has been confirmed by the study of fumaric acid-d, and B/E linked scan studies. In the case of esters, the TMS CI spectra of (E)-isomers contain abundant [ M + 731 + adduct ions, whereas these are weakly abundant in the TMS CI of the (a-isomers.

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