|
Eur. J. Mass Spectrom. 3, 217 - 223 (1997) |
|
Isomerization of thioamidomethyl pyridine ylides and isoquinoline ylides under electron impact | ||
A.T. Lebedev,* T.Yu. Samguina, E.V. Predein and V.A. Bakoulev |
||
ABSTRACT: | ||
The electron impact and collision-induced dissociation spectra of 2-(2-carbethoxy-1-imino-1-methylthio)-ethylene isoquinoline ylide (1), 2-(2-cyano-1-phenylamino-1-methylthio)-ethylene pyridine ylide (2), 2-(2-carboethoxy-1-amino-1-thio)-ethylene pyridine ylide (3),2-(2-carboethoxy-1-amino-1-thio)-ethylene isoquinoline ylide (4) and 2-(1-N-phenylamide-1-cyano)-ethylene pyridine ylide (5) were studied.The molecular ions of compounds 14 were shown to undergo cyclization to the corresponding heterocyclic compounds, analogous to the reaction of compound 1 in solution. Proposed fragmentation schemes are presented based on tandem mass spectrometry and high resolution mass spectrometry data. | ||
Keywords: Intramolecular cyclization, ylides, electron impact,collision-induced dissociation, pyridines, isoquinolines, isomerization. |
© IM Publications
Any problems? E-mail .