期刊
JOURNAL OF MASS SPECTROMETRY
卷 39, 期 8, 页码 966-972出版社
WILEY
DOI: 10.1002/jms.633
关键词
amphetamine derivatives; electron ionization; fragmentation mechanism; ortho effect
The electron ionization-induced fragmentation patterns of three forensically relevant Schiff bases, originating from the condensation between 2-, 3- and 4-methoxyamphetamine and the corresponding ketones, were studied. The proposed fragmentation routes and ion structures are supported by high-resolution data and B/E linked-scan and mass-analyzed ion kinetic energy spectra. The rationalization of the ortho effect, which is responsible for the formation of the [M - OCH3] fragment in the case of the imine bearing ortho-substituted methoxy group, is given. Copyright (C) 2004 John Wiley Sons, Ltd.
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