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| Titel |
Cyclobutyl methyl ketone as a model compound for pinonic acid to elucidate oxidation mechanisms |
| VerfasserIn |
A. P. Praplan, P. Barmet, J. Dommen, U. Baltensperger |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 22 ; Nr. 12, no. 22 (2012-11-16), S.10749-10758 |
| Datensatznummer |
250011595
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| Publikation (Nr.) |
 copernicus.org/acp-12-10749-2012.pdf |
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| Zusammenfassung |
| Although oxidation of the atmospherically relevant compound α-pinene has been
extensively studied, chemical mechanisms leading to the formation of later generation
oxidation products remain poorly understood. The present work uses cyclobutyl methyl
ketone (CMK) to study the oxidation mechanism of pinonic acid, an α-pinene reaction
product, by hydroxyl radicals (·OH). CMK has a similar but simpler chemical
structure compared to pinonic acid. Succinic acid, 4-hydroxybutanoic acid and 4-oxobutanoic
acid were identified as first generation products of CMK. These observed organic acids
were compared to compounds found in secondary organic aerosol formed from the oxidation of
α-pinene. Results suggest that 3-methyl-1,2,3-butanetricarboxylic acid (MBTCA), terpenylic
% corrected name for MBTCA (3-methyl-1,2,3-butanetricarboxylic acid)
acid and diaterpenylic acid acetate are first generation products of OH oxidation of pinonic
acid. Therefore, there is strong evidence that ·OH oxidation greatly increases
the oxygenation of organic compounds (e.g. monocarboxylic acid to tricarboxylic acid) through
radical mechanisms, without requiring a stable intermediate. These observations cannot be
explained by traditional atmospheric chemistry mechanisms. |
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