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Are gas‐phase processes really responsible for the ionization of cyclic acetals by fast‐atom bombardment?
Author(s) -
Paul Gary J. C.,
Bourg Serge,
Bertrand Michel J.
Publication year - 1992
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290060203
Subject(s) - chemistry , fast atom bombardment , chemical ionization , ionization , isobutane , ion , electron ionization , mass spectrometry , hydride , ion source , atom (system on chip) , molar ionization energies of the elements , reagent , analytical chemistry (journal) , hydrogen , organic chemistry , chromatography , computer science , embedded system , catalysis
The mass spectral behavior of a series of substituted 2‐phenyl‐1,3‐dioxolanes has been studied by several ionization techniques in order to gain further insight into the basic ionization mechanisms occurring in the fast‐atom bombardment mass spectrometry. The results obtained show that in chemical ionization, ions of the type [M+H] + are predominant while [MH] + ions are observed as important species in electron ionization and fast‐atom bombardment. Comparison of the gas‐phase hydride‐ion affinities of thr chemical ionization reagent gases ammonia and isobutane with those of the loquid matrices glycerol and dithiothereitol/dithioerythritol indicates that the predomionant formation of the [MH] + ion observed in fast‐atom bombardment by hydride abstraction in the gas phase is improbable. Furthermore, comparison of the electron ionization behavior of the cyclic acetals with that observed under fast‐atom bombardment suggests that the origin of [MH] + in the latter is not related EI gas‐phase processes.