Competing mechanisms for methyl cation formation upon collision-induced dissociation of protonated acetaldehyde

Paul G. Wenthold, Xinping Liu

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Isotopic labeling and energy-resolved collision-induced dissociation (CID) experiments show that methyl cation loss from protonated acetaldehyde occurs by at least two different mechanisms, one involving direct cleavage and the second involving rearrangement. A statistical scrambling mechanism is ruled out from the CID appearance curves for the CH3+ and CH2D+ products from CH3C(OD)H+, whereas a possible kinetic isotope effect is ruled out by using the alternately labeled CD3C(OH)H+ acetaldehyde ion. The results show that dissociation of protonated aldehydes is even more complex than is suggested by standard CID spectra.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalInternational Journal of Mass Spectrometry
Volume207
Issue number1-2
DOIs
StatePublished - Apr 12 2001
Externally publishedYes

Keywords

  • CID
  • Dissociation mechanisms
  • Energy-resolved mass spectrometry
  • Kinetic isotope effects
  • Protonated aldehydes

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