Reassessment of the temperature dependent oxidation of 2-methyl-3-butene-2-ol (MBO) by Cl atoms: A kinetic and product study

In the current study, the temperature dependence of the Cl atom rate coefficient with 2-methyl-3-butene-2-ol (MBO) is re-assessed. Relative rate kinetic measurements were performed inside THALAMOS (thermally regulated atmospheric simulation chamber) facility under atmospheric pressure (760 Torr) of zero air in the temperature range of 256-353 K. The rate coefficient of the title reaction was found to be independent of temperature with a value of k(MBO) = (3.20 +/- 0.10) x 10(-10) cm(3) molecule(-1) s(-1), where the quoted error corresponds to 2 sigma standard error of the mean value and includes the overall uncertainty of the measurements. Besides the kinetic study we have also determined the yields of the major products formed, in the temperature range of 273-353 K. Acetone and chloroacetaldehyde were identified as primary oxidation products with almost identical yields, ranging between 60% and 80%. Formaldehyde and methyl vinyl ketone were also observed with yields below 10% and 0.5%, respectively. Our experimental results indicate that the dominant reaction pathway is the addition of Cl atoms to the terminal carbon atom of MBO.