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    An Experimental Study of the Gas-Phase Reactions of NO<sub>3</sub> Radicals with a Series of Unsaturated Aldehydes: <i>trans</i>-2-Hexenal, <i>trans</i>-2-Heptenal, and <i>trans</i>-2-Octenal

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    Rate constants for the gas-phase reactions of the NO<sub>3</sub> radical with a series of unsaturated aldehydes, <i>trans</i>-2-hexenal, <i>trans</i>-2-heptenal, and <i>trans</i>-2-octenal, have been measured using absolute rate method at 294 Ā± 3 K and atmospheric pressure. This work was performed to clarify discrepancies found in the literature and thus led to a clearer view of the effect of the increasing carbon chain length on the reactivity of <i>trans</i>-2-alkenals. The rate constants were determined to be (4.7 Ā± 1.5) Ɨ 10<sup>ā€“15</sup>, (5.3 Ā± 1.6) Ɨ 10<sup>ā€“15</sup>, and (5.6 Ā± 2.3) Ɨ 10<sup>ā€“15</sup> cm<sup>3</sup> molecule<sup>ā€“1</sup> s<sup>ā€“1</sup> for <i>trans</i>-2-hexenal, <i>trans</i>-2-heptenal, and <i>trans</i>-2-octenal, respectively. These results clearly indicate that the carbon chain lengthening of the <i>trans</i>-2-alkenals does not significantly affect the rate constant. In addition, the mechanism for the reaction of NO<sub>3</sub> with these unsaturated aldehydes was also investigated. Unsaturated peroxynitrate-type compounds that are exclusively formed through the abstraction channel were observed as the main products
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