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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
Author(s) -
Tse Cecilia W.,
Flagan Richard C.,
Seinfeld John H.
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:7<523::aid-kin6>3.0.co;2-w
Subject(s) - chemistry , reaction rate constant , benzaldehyde , atmospheric pressure , gas phase , molecule , radical , analytical chemistry (journal) , kinetics , organic chemistry , catalysis , meteorology , physics , quantum mechanics
Rate constants for three dimethylbenzaldehydes and two trimethylphenolshave been determined for the OH reactions at 298±2 K and atmosphericpressure using a relative rate method. The OH reaction rate constants wereplaced on an absolute basis using the literature rate constant for 1,2,4‐trimethylbenzeneof (3.25±0.5)×10 −11 cm 3 molecule −1 s −1 ). The measured rate constants were (inunits of cm 3 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 concentrationof 8.7×10 5 molecule cm −3 , the estimated atmospheric lifetimes are ca. 7.5 h for 2,4‐ and2,5‐dimethylbenzaldehydes, ca. 15 h for 3,4‐dimethylbenzaldehyde,ca. 2.5 h for 2,3,5‐ and 2,3,6‐trimethylphenols. The reactivities ofthe trimethylphenols exceed those of the dimethyl‐benzaldehydes bymore than a factor of 3. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 523–525, 1997.