Gas-phase oxidation of methyl crotonate and ethyl crotonate. Kinetic study of their reactions towards OH radicals and Cl atoms

M. A. TERUEL, J. BENITEZ-VILLALBA, N. CABALLERO, M. B. BLANCO

AMER CHEMICAL SOC

Lugar: Washington; Año: 2012 vol. 116 p. 6127 - 6127

ate coefficients for the reactions of hydroxyl radicals and chlorine atoms with methyl crotonate and ethyl crotonate have been determined at 298 K and atmospheric pressure. The decay of the organics was monitored using gas chromatography with flame ionization detection (GC-FID), and the rate constants were determined using the relative rate method with different reference compounds. Room temperature rate coeficcients were found to be (in cm3 molecule−1 s−1): k1(OH + CH3CHCHC(O)OCH3) = (4.65 ± 0.65) × 10−11, k2(Cl + CH3CH CHC(O)OCH3) = (2.20 ± 0.55) × 10−10, k3(OH + CH3CH CHC(O)OCH2CH3) = (4.96 ± 0.61) × 10−11, and k4(Cl + CH3CH CHC(O)OCH2CH3) = (2.52 ± 0.62) × 10−10 with uncertainties representing ±2σ. This is the first determination of k1, k3, and k4 under atmospheric pressure. The rate coefficients are compared with previous determinations for other unsaturated and oxygenated VOCs and reactivity tre