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Fragmentation of the enolate ion of 2,3-butanedione. Characterization of the acetyl anion by charge inversion mass spectrometry

✍ Scribed by Swapan Chowdhury; Alex. G. Harrison

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 537 KB
Volume: 24
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210240211

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✦ Synopsis

The unimolecular and collision-induced fragmentation reactions of the enolate ion of 2,3-butanedione, [CH,COCOCH,]-, have been studied. Unimolecular fragmentation on the metastable ion time-scale forms [HCCOl-, [C,H,O]-, [C,H,OI-and [CH,CO,]-. Charge inversion m a s spectrometry shows that the [C,H,O]-ion is the acetyl anion while the [C,H,O]-product is the acetone enolate ion; formation of the latter product involves a large release of kinetic energy (TI,, = 0.99 eV). The fragmentation reactions occurring following collisional activation have been determined for 8 keV collisions and over the range 1.5-30 eV center-of-mas collision energy. Formation of [HCCOl-and [CH,CO]are of the most important reactions following collisional activation and it is concluded that the two reactions have similar critical reaction energies even though formation of [HCCOl-is favored thermochemically.

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