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Studies in organic mass spectrometry. Part 9 —mass spectra of 9,10‐disubstituted 2,3,6,7‐tetraalkoxy‐9,10‐dihydroanthracenes: A remarkable loss of radicals from even‐electron ions
Author(s) -
Ceraulo Leopoldo,
Agozzino Pasquale,
Ferrugia Mirella,
Lamartina Liliana,
Natoli Maria Concetta
Publication year - 1991
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.1210260419
Subject(s) - substituent , fragmentation (computing) , ion , mass spectrum , electron ionization , mass spectrometry , chemistry , radical , kinetic energy , analytical chemistry (journal) , electron , spectral line , medicinal chemistry , organic chemistry , chromatography , physics , ionization , quantum mechanics , astronomy , computer science , operating system
The electron impact‐induced fragmentations of 23 9,10‐disubstituted 2,3,6,7‐tetraalkoxy‐9,10‐dihydroanthracenes, including six stereoisomeric pairs, were studied. The loss of the 9‐(or 10‐)substituent constitutes the main fragmentation route. The resulting ions give rise to a remarkable violation of the so‐called ‘even‐electron rule’ as they eject the second substituent at the 10‐(or 9‐)position as a radical. The latter aspect was particularly investigated with the aid of low‐energy (nominal value 15 eV) and mass‐analysed ion kinetic energy spectra.