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26 April 2024

» pubmed » pmid15890844

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Enols are common intermediates in hydrocarbon oxidation
Craig A Taatjes ; Nils Hansen ; Andrew McIlroy ; James A Miller ; Juan P Senosiain ; Stephen J Klippenstein ; Fei Qi ; Liusi Sheng ; Yunwu Zhang ; Terrill A Cool ; Juan Wang ; Phillip R Westmorel ; Matthew E Law ; Tina Kasper ; Katharina Kohse-Höinghaus ;
Date:	24 Jun 2005
Journal:	Science, 308 (5730), 1887-9
Abstract:	Models for chemical mechanisms of hydrocarbon oxidation rely on spectrometric identification of molecular structures in flames. Carbonyl (keto) compounds are well-established combustion intermediates. However, their less-stable enol tautomers, bearing OH groups adjacent to carbon-carbon double bonds, are not included in standard models. We observed substantial quantities of two-, three-, and four-carbon enols by photoionization mass spectrometry of flames burning representative compounds from modern fuel blends. Concentration profiles demonstrate that enol flame chemistry cannot be accounted for purely by keto-enol tautomerization. Currently accepted hydrocarbon oxidation mechanisms will likely require revision to explain the formation and reactivity of these unexpected compounds.
Source:	PubMed, pmid15890844 doi: 10.1126/science.1112532
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