Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.795572
Title: Mass spectroscopy of organic compounds
Author: McCormick, Andrew
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1966
Availability of Full Text:
Access from EThOS:
Access from Institution:
Abstract:
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: uk.bl.ethos.795572  DOI: Not available
Share: