Using a relative rate method, rate constants for the gas‐phase reactions of OH radicals with allyl alcohol, 3‐buten‐1‐ol, 3‐buten‐2‐ol, and 2‐methyl‐3‐buten‐2‐ol have been measured at 296 ± 2 K and atmospheric pressure of air. Using 1,3,5‐trimethylbenzene as the reference compound, the rate constants (in units of 10−11 cm3 molecule−1 s−1) were: allyl alcohol, 5.46 ± 0.35; 3‐buten‐1‐ol, 5.50 ± 0.20; 3‐buten‐2‐ol, 5.93 ± 0.23; and 2‐methyl‐3‐buten‐2‐ol, 5.67 ± 0.13; where the indicated errors are two least‐squares standard deviations and do not include the uncertainty in the rate constant for 1,3,5‐trimethylbenzene. The H‐atom abstraction products acrolein and methyl vinyl ketone were observed from the allyl alcohol and 3‐buten‐2‐ol reactions, respectively, with respective yields of 5.5 ± 0.7 and 4.9 ± 1.4%. No evidence for formation of acrolein from 3‐buten‐1‐ol or 3‐buten‐2‐ol was obtained, with upper limits to the acrolein yields of ≤1.2 and ≤0.5%, respectively, being determined. Reaction mechanisms are discussed. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 142–147, 2001

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By using relative rate methods, rate constants for the gas-phase reactions of OH and NO 3 radicals with propanal, butanal, pentanal, and hexanal have been measured at 296 Ϯ 2 K and atmospheric pressure of air. By using methyl vinyl ketone as the reference compound, the rate constants obtained for the OH radical reactions (in units of 10) were propanal, 20.2 Ϯ 1.4; butanal, 24.7 Ϯ 1.5; pentanal, 29.9 Ϯ 1.9; and hexanal, 31.7 Ϯ 1.5. By using methacrolein and 1-butene as the reference compounds, the rate constants obtained for the NO 3 radical reactions (in units of 10 Ϫ15 cm 3 molecule Ϫ1 s Ϫ1 ) were propanal, 7.1 Ϯ 0.4; butanal, 11.2 Ϯ 1.5; pentanal, 14.1 Ϯ 1.6; and hexanal, 14.9 Ϯ 1.3. The dominant tropospheric loss process for the aldehydes studied here is calculated to be by reaction with the OH radical, with calculated lifetimes of a few hours during daytime.

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