Gas-Phase Reactivity of Copper Cations with Ketones

Gas-phase ion–molecule reactions between copper ions and ketones were investigated. Organometallic adducts were prepared using a chemical ionisation/fast-atom bombardment source. Abundant pseudo-molecular ion adducts were observed in the Cu+-chemical ionisation mass spectra and their unimolecular de...

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Bibliographic Details
Published in:European journal of mass spectrometry (Chichester, England) England), 2001-08, Vol.7 (4-5), p.313-320
Main Authors: Fordham, P., Deschasse, M., Haldys, V., Tortajada, J., Morizur, J.-P.
Format: Article
Language:English
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Summary:Gas-phase ion–molecule reactions between copper ions and ketones were investigated. Organometallic adducts were prepared using a chemical ionisation/fast-atom bombardment source. Abundant pseudo-molecular ion adducts were observed in the Cu+-chemical ionisation mass spectra and their unimolecular decompositions were studied by tandem mass spectrometry. Mass-analysed ion kinetic energy spectroscopy revealed diagnostic fragmentation patterns. Losses of alkenes, losses of alkanes and dehydrogenation and dehydration reactions were observed, as well as eliminations of CuR (R = CnH2n + 1). The rich reaction chemistry of the cationised ketones enabled differentiation of the majority of the linear and branched ketone isomers studied. Isotope-labelled derivatives were employed to elucidate fragmentation mechanisms.
ISSN:1469-0667
1751-6838
DOI:10.1255/ejms.441