Anomalies in the molecular ion region in the electron impact mass spectra of α- and β-hydroxyesters |
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Authors: | Leszek Konopski |
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Abstract: | In the electron impact mass spectra of some alkyl α- and β-hydroxyesters (introduced using the gas chromatography/mass spectrometry (GC/MS) technique), the absence of the molecular ion M+· and the presence of the [M + 1]+ ion instead is observed. This phenomenon is especially characteristic of C3? C6 glycolates and diethyl malate, and is due to chemical auto-ionization—ion-molecule reactions in the high concentration gradient at the top of the GC peak. The existence of the [M ? 2]+·, [M ?1]+ and M+· ions in the mass spectra of other β- and α-hydroxyesters is discussed. |
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