Organic Mass Spectrometry p. 977 - 983 (1989)
Update date:2022-08-29
Topics:
Corval, M.
Harrata, A.
Morizur, J-P.
The fragmentations of the acylium ions O=C+-CH2-CH2-CO2CH3 and O=C+-CH2-CH2-COCH3 generated from methyl levulinate are governed extensively by the interaction of the two carbonyl groups.Both species eliminate a molecule of CO unimolecularly and under CID conditions.The results derived from measurements of 13C and 18O labelled precursors, together with kinetic energy release values, have been used to study the mechanisms.In the first of these acylium ions, both carbonyl groups are equivalent; this phenomenon can be the result of a 1,4 methoxy shift.In the second acylium ion, only the oxygen atoms change their positions; this isomerization occurs via the
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