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

✍ Scribed by Cecilia W. Tse; Richard C. Flagan; John H. Seinfeld

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 95 KB
• Volume: 29
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1997)29:7<523::aid-kin6>3.0.co;2-w

✦ Synopsis

Rate constants for three dimethylbenzaldehydes and two trimethylphenols have been determined for the OH reactions at 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 . The measured rate constants were (in units of ) 2,4-dimethyl-benzaldehyde, ; 2,5-dimethylbenzaldehyde, ; 3,4-dimethylbenzaldehyde, ; and 2,3,5-trimethylphenol, , 2,3,6-trimethylphenol, . Using an average OH concentration of , 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.