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Title:Isomerization and fragmentation of cyclohexanone in a heated micro-reactor
Author(s):Ellison, Barney
Contributor(s):Daily, John W.; Stanton, John F.; Ahmed, Musahid; Kostko, Oleg; Troy, Tyler; Buckingham, Grant; Baraban, Joshua H.; Nguyen, Thanh Lam; Porterfield, Jessica P.
Subject(s):Conformers, isomers, chirality, stereochemistry
Abstract:\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.185]{TableofContents.eps} \end{wrapfigure} The thermal decomposition of cyclohexanone (\chem{C_6H_{10}}=O) has been studied in a set of flash-pyrolysis micro-reactors. Samples of \chem{C_6H_{10}}=O were first observed to decompose at 1200 K. Short residence times of 100 $\mu$sec and dilution of samples ($<$0.1\%) isolate unimolecular decomposition. Products were identified by tunable VUV photoionization mass spectroscopy, photoionization appearance thresholds, and complementary matrix infrared absorption spectroscopy. Thermal cracking of cyclohexanone appeared to result from a variety of competing pathways pictured to the right. Isomerization of cyclohexanone to the enol, cyclohexen-1-ol (\chem{C_6H_9OH}), is followed by retro-Diels-Alder cleavage to \chem{CH_2}=\chem{CH_2} and \chem{CH_2}=\chem{C(OH)}-CH=\chem{CH_2}. Further isomerization of \chem{CH_2}=C(OH)CH=\chem{CH_2} to methyl vinyl ketone (\chem{CH_3CO}CH=\chem{CH_2}, MVK) was also observed. Photoionization spectra identified both enols, \chem{C_6H_9OH} and CH=C(OH)CH=\chem{CH_2}, and the ionization threshold of \chem{C_6H_9OH} was measured to be 8.2 $\pm$ 0.1 eV. At 1200 K, the products of cyclohexanone pyrolysis were found to be: \chem{C_6H_9OH}, \chem{CH_2}=C(OH)CH=\chem{CH_2}, MVK, \chem{CH_2CHCH_2}, CO, \chem{CH_2}=C=O, \chem{CH_3}, \chem{CH_2}=C=\chem{CH_2}, \chem{CH_2}=CH-CH=\chem{CH_2}, \chem{CH_2}=\chem{CHCH_2CH_3}, \chem{CH_2}=\chem{CH_2}, and HCCH.
Issue Date:2016-06-20
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2017-01-26

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