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Study of Acetylated Methyl 2-Deoxy-D-erythro-pentosides by Electron Impact and Chemical Ionization Mass Spectrometry

V. Kováčik, J. Kozák, and Š. Kučár

Institute of Chemistry, Slovak Academy of Sciences, CS-842 38 Bratislava


Abstract: Anomeric pairs of methyl 3,5-di-O-acetyl-2-deoxy-D-erythro-pentofuranosides and methyl 3,4-di-O-acetyl-2-deoxy-D-erythro-pentopyranosides have been studied by electron impact and chemical ionization mass spectrometry. Electron impact fragmentation was verified by measurements of metastable transitions, as well as using collision-induced spectra, obtained after collision with helium atoms. The ring size can be unambiguously determined from electron impact spectra. Metastable and collision spectra of [M - OCH3]+ ions, as well as of [M + NH4]+ cluster ions, also reflect the ring size of the compounds under study. Configuration of the anomeric pairs cannot be determined unambiguously from the quantitative differences found in their spectra.

Full paper in Portable Document Format: 464a249.pdf


Chemical Papers 46 (4) 249–252 (1992)

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