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Rate constants for the gas-phase reaction of OH radicals with a series of ketones at 299 ± 2 K

✍ Scribed by Roger Atkinson; Sara M. Aschmann; William P. L. Carter; James N. Pitts Jr.

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
475 KB
Volume
14
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

Relative rate constants for the reaction of OH radicals with a series of ketones have been determined at 299 ± 2 K, using methyl nitrite photolysis in air as a source of hydroxyl radicals. Using a rate constant for the reaction of OH radicals with cyclohexane of 7.57 × 10^−12^ cm^3^ molecule^−1^ s^−1^, the rate constants obtained are (× 10^12^ cm^3^ molecule^−1^ s^−1^): 2‐pentanone, 4.74 ± 0.14; 3‐pentanone, 1.85 ± 0.34; 2‐hexanone, 9.16 ± 0.61; 3‐hexanone, 6.96 ± 0.29; 2,4‐dimethyl‐3‐pentanone, 5.43 ± 0.41; 4‐methyl‐2‐pentanone, 14.5 ± 0.7; and 2,6‐dimethyl‐4‐heptanone, 27.7 ± 1.5. These rate constants indicate that while the carbonyl group decreases the reactivity of CH bonds in the α position toward reaction with the OH radical, it enhances the reactivity in the β position.

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