Products of the gas-phase reactions of a series of methyl-substituted ethenes with the OH radical

Journal Article · Wed Jul 15 04:00:00 EDT 1998 · Environmental Science and Technology

DOI:https://doi.org/10.1021/es980153a· OSTI ID:655421

Tuazon, E C; Aschmann, S M; Arey, J; Atkinson, R ^[1]

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1. Univ. of California, Riverside, CA (United States). Air Pollution Research Center

Alkenes are a significant component of ambient air in urban areas, and in the atmosphere they react with OH radicals, NO{sub 3} radicals, and O{sub 3}, with the OH radical reaction often dominating as the tropospheric removal process. Products of the gas-phase reactions of the OH radical with 2-methylpropene, cis-2-butene, 2-methyl-2-butene, and 2,3-dimethyl-2-butene in the presence of NO have been investigated at room temperature and 740 Torr total pressure of air by gas chromatography with flame ionization detection, in situ Fourier transform infrared absorption spectroscopy, and in situ atmospheric pressure ionization tandem mass spectrometry (API-MS). For all four alkenes, hydroxynitrate formation from the {beta}-hydroxyalkyl peroxy radical plus NO reaction accounted for {approximately} 10% of the overall products observed, with decomposition of the intermediate {beta}-hydroxyalkoxy radical dominating over the alternative reaction with O{sub 2} (isomerization via a six-member transition state is not possible for any of the intermediate {beta}-hydroxyalkoxy radicals formed in these reactions) and leading to the formation of the carbonyls expected from >C{double_bond}C< bond cleavage in {approximately} 90% yield each.

• OSTI ID: 655421
• Journal Information: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 14 Vol. 32; ISSN ESTHAG; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ALKENES
HYDROXYL RADICALS
PHASE STUDIES
PHOTOCHEMICAL REACTIONS