Observation of the simplest Criegee intermediate CH[subscript 2]OO in the gas-phase ozonolysis of ethylene
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Author(s)
Womack, Caroline C.
Martin-Drumel, Marie-Aline
Brown, Gordon G.
Field, Robert W.
McCarthy, Michael C.
Date Issued
March 2015
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Womack, C. C., M.-A. Martin-Drumel, G. G. Brown, R. W. Field, and M. C. McCarthy. “Observation of the Simplest Criegee Intermediate CH[subscript 2]OO in the Gas-Phase Ozonolysis of Ethylene.” Science Advances 1, no. 2 (March 1, 2015): e1400105–e1400105.
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Final published version
Abstract
Ozonolysis is one of the dominant oxidation pathways for tropospheric alkenes. Although numerous studies have confirmed a 1,3-cycloaddition mechanism that generates a Criegee intermediate (CI) with form R[subscript 1]R[subscript 2]COO, no small CIs have ever been directly observed in the ozonolysis of alkenes because of their high reactivity. We present the first experimental detection of CH[subscript 2]OO in the gas-phase ozonolysis of ethylene, using Fourier transform microwave spectroscopy and a modified pulsed nozzle, which combines high reactant concentrations with rapid sampling and sensitive detection. Nine other product species of the O[subscript 3] + C[subscript 2]H[subscript 4] reaction were also detected, including formaldehyde, formic acid, dioxirane, and ethylene ozonide. The presence of all these species can be attributed to the unimolecular and bimolecular reactions of CH[subscript 2]OO, and their abundances are in qualitative agreement with published mechanisms and rate constants.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1126/sciadv.1400105
