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Anomalies in the molecular ion region in the electron impact mass spectra of α‐ and β‐hydroxyesters
Author(s) -
Konopski Leszek
Publication year - 1990
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.1210251009
Subject(s) - mass spectrum , electron ionization , ion , chemistry , polyatomic ion , mass spectrometry , analytical chemistry (journal) , molecule , ionization , chemical ionization , alkyl , spectral line , chromatography , organic chemistry , physics , astronomy
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 C 3 C 6 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.