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Mass spectra of some 5- and 6-substituted-2-pyridinecarboxylic acids. Nature of fragmentation step for loss of CO2 (1970)

Moser, Russell J. ; Brown, Ellis V.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 4 (1970), S. 555-561

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Details

ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The fragmentation patterns were obtained by electron-impact on 6-acetamido-, 6-amino-, 6-bromo-, 6-chloro-, 6-methoxy-, 6-methyl-, 6-nitro-, 5-carboxy-, 5-iodo-, 5-methoxy- and 5-nitro-2-pyridinecarboxylic acids, as well as 2- and 3-pyridinecarboxylic acids. Most of these acids lost CO2 [M - 44] as their first major fragmentation. This is in direct contrast to the substituted benzoic acids which show loss of OH [M - 17] or CO2H [M - 45] in their first major fragmentation. Our work suggests that the ring nitrogen may determine which pathway predominates. Figures are presented to illustrate the patterns and metastable ions are indicated when found for the transitions discussed.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210040156

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The NMR spectra of 1,4-dioxin and 1,4-dithiin partially oriented in a nematic phase (1972)

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