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Ion/Neutral Complex‐mediated Reactions Generated from Some Ionized Tetrahydroimidazole‐substituted Methylene β‐Diketones
Author(s) -
She YiMin,
Liu ShuYing,
Li XiuMei
Publication year - 1997
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/(sici)1097-0231(19970422)11:7<723::aid-rcm863>3.0.co;2-x
Subject(s) - chemistry , dissociation (chemistry) , methylene , ion , collision induced dissociation , tandem mass spectrometry , mass spectrometry , molecule , ionization , metastability , photochemistry , mass spectrum , computational chemistry , medicinal chemistry , organic chemistry , chromatography
The dissociation of gaseous metastable ions of m/z 153 and the formation of ions of m/z 139 from the unimolecular fragmentations of ionized tetrahydroimidazole‐substituted methylene β‐diketones were examined by tandem mass spectrometry. In addition, some other fragments accompanying the elimination of either an H 2 O molecule or an CHO • radical were also observed in the collision‐induced dissociation spectra of molecular ions of the compounds bearing an aromatic ring. Collision‐induced dissociation and isotopic labeling showed that these processes may involve reactions of intermediate ion/neutral complexes and multistep rearrangements. The corresponding mechanisms are discussed. © 1997 John Wiley & Sons, Ltd.