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Mass spectra of dicyanomethylene derivatives of benzophenone analogs
Author(s) -
Wang ChingBore,
Her GuorRong,
Watson J. Throck
Publication year - 1983
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.1210181102
Subject(s) - benzophenone , fragmentation (computing) , mass spectrum , chemistry , electron ionization , moiety , ion , dissociation (chemistry) , photochemistry , mass spectrometry , bond cleavage , ionization , spectral line , double bond , stereochemistry , computational chemistry , polymer chemistry , organic chemistry , catalysis , physics , chromatography , astronomy , computer science , operating system
The dicyanomethylene derivative of a benzophenone analog significantly alters the fragmentation pattern observed during electron impact ionization of the underivatized parent compound. A double bond connecting the dicyanomethylene moiety to the parent compound is cleaved during a major fragmentation pathway for many of these compounds. A mechanism involving rearrangement of two hydrogen atoms is proposed to rationalize cleavage of this double bond. Conventional mass spectra as well as collisionally activated dissociation mass spectra of selected ions of several model compounds are reported and described in support of a proposed fragmentation mechanism.