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Tetramethylsilane chemical ionization mass spectrometry of some isomeric unsaturated dicarboxylic acids and esterst
Author(s) -
Srinivas R.,
Vairamani M.,
Kumar K. V. Siva,
Rajeev M. S.,
Rao G. K. Viswanadha
Publication year - 1992
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210271123
Subject(s) - tetramethylsilane , fumaric acid , chemistry , phthalic acid , adduct , mass spectrometry , chemical ionization , mass spectrum , ion , dicarboxylic acid , medicinal chemistry , organic chemistry , ionization , chromatography
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 ( E )‐acids show an abundant [M + 73 − CH 4 ] + Ion whereas the ( Z )‐acids exhibit a strong [M + 73 − H 2 O] + ion in their TMS CI spectra. The loss of CH 4 from the adduct of fumaric acid has been confirmed by the study of fumaric acid‐ d 2 and B / E linked scan studies. In the case of esters, the TMS CI spectra of ( E )‐isomers contain abundant [M + 73] + adduct ions, whereas these are weakly abundant in the TMS CI of the (Z)‐isomers.