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Title: Mass spectroscopy of organic compounds
Author: McCormick, Andrew
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1966
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The mass spectra of twelve dihydro-1,3-benzothiazines and six dihydro-1,3-benzoxazines are recorded. A brief discussion of the particular fragmentations of a few of these is given. The majority of the compounds have a substituted phenyl group on the 2-position of the oxazine or thiazine ring. These compounds fragment in a characteristic fashion in the mass spectrometer which can be described as a retro-Diels-Alder reaction. The relative abundances of the ions produced by this are related to the electron donating power of the substituents on the 2-phenyl group and the conclusion is reached that the phenyl ring opens on electron impact - which is in contrast to the findings of previous workers who studied the effect of substituents on the electron-impact-induced dissociation of aromatic ketones. A study of the relative rates of formation of ions produced by the retro-Diels-Alder reaction reveals that this is a two-step process and that a different bond is initially broken in the two series of compounds.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available