The mass spectrum of 2,4‐dihydroxybenzophenone oxime

Abstract

2,4-Dihydroxybenmphenone oxime is found to undergo loss of OH., H,O, NHOH and PhCNO when subjected to electron impact, revealing novel hydrogen and skeletal migrations. The fragmentation mechanisms are found to differ considerably from those of benzophenone oxime and we confirmed these cleavages by exact mass measurements and deuterium labelling.

Unexpected Dimerizations of Arylfurfural Oximes in their Mass Spectra

“…On closer examination it became evident that these m/z ion peaks coincided with the process of a loss of OH radical from the molecular ion peak concomitant with its dimerization. Oximes are well known to eliminate an OH radical from their molecular radical ions [10][11][12]. In the case of these oximes the dimer further fragments by the elimination of a nitrogen molecule (m/z 28).…”