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Rate constants for the gas-phase reaction of the hydroxyl radical with a series of dimethylbenzaldehydes and trimethylphenols at atmospheric pressure

Tse, Cecilia W. and Flagan, Richard C. and Seinfeld, John H. (1997) Rate constants for the gas-phase reaction of the hydroxyl radical with a series of dimethylbenzaldehydes and trimethylphenols at atmospheric pressure. International Journal of Chemical Kinetics, 29 (7). pp. 523-525. ISSN 0538-8066. doi:10.1002/(SICI)1097-4601(1997)29:7%3C523::AID-KIN6%3E3.0.CO;2-W. https://resolver.caltech.edu/CaltechAUTHORS:20230222-182702433

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Abstract

Rate constants for three dimethylbenzaldehydes and two trimethylphenols have been determined for the OH reactions at 298±2 K and atmospheric pressure using a relative rate method. The OH reaction rate constants were placed on an absolute basis using the literature rate constant for 1,2,4-trimethylbenzene of (3.25±0.5)×10⁻¹¹ cm³ molecule⁻¹s⁻¹). The measured rate constants were (in units of cm³ molecule⁻¹ s⁻¹) 2,4-dimethyl-benzaldehyde, (4.32±0.67)×10⁻¹¹; 2,5-dimethylbenzaldehyde, (4.37±0.68)×10⁻¹¹; 3,4-dimethylbenzaldehyde, (2.14±0.34)×10⁻¹¹; and 2,3,5- trimethylphenol, (12.5±1.9)×10⁻¹¹, 2,3,6-trimethylphenol, (11.8±1.8)×10⁻¹¹. Using an average OH concentration of 8.7×10⁵ molecule cm⁻³, the estimated atmospheric lifetimes are ca. 7.5 h for 2,4- and 2,5-dimethylbenzaldehydes, ca. 15 h for 3,4-dimethylbenzaldehyde, ca. 2.5 h for 2,3,5- and 2,3,6-trimethylphenols. The reactivities of the trimethylphenols exceed those of the dimethyl-benzaldehydes by more than a factor of 3.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/(SICI)1097-4601(1997)29:7%3C523::AID-KIN6%3E3.0.CO;2-WDOIArticle
ORCID:
AuthorORCID
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Issue or Number:7
DOI:10.1002/(SICI)1097-4601(1997)29:7%3C523::AID-KIN6%3E3.0.CO;2-W
Record Number:CaltechAUTHORS:20230222-182702433
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20230222-182702433
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:119469
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Feb 2023 19:31
Last Modified:22 Feb 2023 19:31

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