de Hoffmann, Edmond
[UCL]
George-Koch, I
Ghosez, Léon
[UCL]
Fragmentations of ions obtained by electron impact ionisation of twenty-four chloro-and bromoenamines have been studied by low collision energy tandem mass spectrometry. For most compounds the main fragmentation pathways involved (a) loss of an halogen atom, (b) loss of an alkyl group linked to the nitrogen atom, (c) loss of an alkyl fragment from the beta-position. Some structural features were found to induce specific fragmentation pathways. Thus, when the entire enamine function is part of a five-membered ring, the loss of an hydrogen atom was observed as a consequence of a stereoelectronic effect. The presence of a vinyl group at the beta-position gave rise to fragments containing a pyridine ring.
Bibliographic reference |
de Hoffmann, Edmond ; George-Koch, I ; Ghosez, Léon. Electron ionisation and CID mass spectra of alpha-haloenamines. In: Societes Chimiques Belges. Bulletin, Vol. 106, no. 7-8, p. 475-479 (1997) |
Permanent URL |
http://hdl.handle.net/2078.1/45580 |