Gas phase reaction of the hydroxyl radical with the unsaturated peroxyacyl nitrate CH2 = C(CH3)C(O)OONO2

Article abstract of DOI:10.1002/kin.550251106

The gas phase reaction of the hydroxyl radical with the unsaturated peroxyacyl nitrate CH₂C(CH₃)C(O)OONO₂ (MPAN) has been studied at 298 ± 2 K and atmospheric pressure. The OH-MPAN reaction rate constant relative to that of OH+ n-butyl nitrate is 2. 08 ± 0.25. This ratio, together with a literature rate constant of 1.74 ×10^-12cm³molecule^-1s^-1 for the OH+ n-butyl nitrate reaction at 298 K, yields a rate constant of (3.6 ± 0.4) × 10^-12cm³ molecule^-1S^-1 for the OH-MPAN reaction at 298 ± 2 K. Hydroxyacetone and formaldehyde are the major carbonyl products. The yield of hydroxyacetone, 0.59 ± 0.12, is consistent with preferential addition of OH at the unsubstituted carbon atom. Atmospheric persistence and removal processes for MPAN are briefly discussed.