Mass Spectrometry of Some Substituted 2-Benzylidenecyclohexanone Oximes

Abstract

The mass spectra of several substituted 2-benzylidenecyclohexanone oximes have been determined at 70 eV and at lower ionization voltages. The major fragmentation pathways for the oximes are loss of the ortho substituent from the parent ion as well as loss of hydroxyl radical. The facility of loss of the ortho substituent is compared with a similar process involved in the fragmentation of substituted 2-benzylidenecyclohexanones. In addition, the mass spectrum of the acetate of 2-benzylidenecyclohexanone oxime was determined and showed a M – 1 peak and also a peak corresponding to the parent oxime formed by loss of ketene.