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Kinetics of the reactions of OH radicals with n-alkanes at 299 ± 2 K

✍ Scribed by R. Atkinson; S. M. Aschmann; W. P. L. Carter; A. M. Winer; J. N. Pitts Jr.

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
362 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 n‐alkanes have been determined at 299 ± 2 K, using methyl nitrite photolysis in air as a source of OH radicals. Using a rate constant for the reaction of OH radicals with n‐butane of 2.58 × 10^−12^ cm^3^ molecule^−1^s^−1^, the rate constants obtained are (X10^12^ cm^3^ molecule^−1^ s^−1^): propane 1.22 ± 0.05, n‐pentane 4.13 ± 0.08, n‐heptane 7.30 ± 0.17, n‐octane 9.01 ± 0.19, n‐nonane 10.7 ± 0.4, and n‐decane 11.4 ± 0.6. The data for propane, n‐pentane, and n‐octane are in good agreement with literature values, while those for n‐heptane, n‐nonane, and n‐decane are reported for the first time. These data show that the rate constant per secondary C—H bond is ∽40% higher for —CH~2~— groups bonded to two other —CH~2~— groups than for those bonded to a —CH~2~— group and a —CH~3~ group.

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