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https://doi.org/10.5194/acp-2019-867
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-867
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Feb 2020

Submitted as: research article | 13 Feb 2020

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A revised version of this preprint is currently under review for the journal ACP.

Atmospheric fate of two relevant unsaturated ketoethers: kinetics, products and mechanisms for the reaction of hydroxyl radicals with (E)-4-methoxy-3-buten-2-one and 1-(E)-1-methoxy-2-methyl-1-penten-3-one

Rodrigo Gastón Gibilisco1, Ian Barnes1,, Iustinian Gabriel Bejan2, and Peter Wiesen1 Rodrigo Gastón Gibilisco et al.
  • 1Bergische Universität Wuppertal, Institute for Atmospheric and Environmental Research, 42097 Wuppertal, Germany
  • 2Faculty of Chemistryand Integrated Center of Environmental Science Studies in the North East Region – CERNESIM, Al. I. Cuza University, Iasi, Romania
  • deceased

Abstract. The kinetics of the gas-phase reactions of hydroxyl radicals with two unsaturated methoxy-ketones at (298 ± 3) K and 1 atm of synthetic air have been studied for the first time using the relative rate technique in an environmental reaction chamber by in situ FTIR spectrometry. The rate coefficients obtained using propene and isobutene as reference compounds were (in units of 10–10 cm3 molecule−1 s−1) as follows: k1(OH + (E)-4-methoxy-3-buten-2-one) = (1.42 ± 0.12), and k2(OH + 1-(E)-1-methoxy-2-methyl-1-penten-3-one) = (3.34 ± 0.43). In addition, quantification of the main oxidation products has been performed and degradation mechanisms for these reactions were developed. The formation products and kinetic data confirm that the reactions proceed mainly via an addition of the OH radical to the double bond. Gas phase products, identified and quantified from these reactions, are carbonyls like methyl formate, methyl glyoxal and 2,3-pentanedione and long-lived nitrogen containing compounds such as PAN and PPN. Atmospheric lifetimes and the ozone formation potential have been estimated and possible atmospheric implications assessed.

Rodrigo Gastón Gibilisco et al.

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Rodrigo Gastón Gibilisco et al.

Rodrigo Gastón Gibilisco et al.

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