Mechanistic aspects of high-energy collision-induced dissociation proximate to the charge in saturated fatty acid N-butyl esters cationized with lithium. Evidence for hydrogen radical removal
✍ Scribed by Libérata Nizigiyimana; Padinchare K. Rajan; Achiel Haemers; Magda Claeys; Peter J. Derrick
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 127 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0951-4198
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✦ Synopsis
The high-energy collision-induced dissociation spectra of [M + Li] + ions of n-butyl palmitate or heptadecanoate and their labelled isotopomers containing a 2 H 2 -label at the C-2, C-3 and C-4 positions are reported. As is the case for positions remote from the charge, the removal of a hydrogen radical at proximate positions has been found to be an initial and decisive fragmentation reaction when [M + Li] + ions are subjected to high-energy collision-induced dissociation. It is also demonstrated that direct C-C cleavage involving γ bonds relative to the carbonyl bond or bonds more remote from the charge may be regarded as a secondary fragmentation route. Direct C-C cleavage of the β bond should, however, be considered as a reaction competitive with C-H cleavage in the formation of the corresponding distonic ions.