The relative hydroxyl radical reaction rate constants from the simulated atmospheric oxidation of selected acetates and other esters have been measured. Reactions were carried out at 297 2 2 K in 100-liter FEP Teflon@-film bags. The OH radicals were generated from the photolysis of methyl nitrite in pure air. Using a rate constant of 2.63 X lo-" cm3 molecule-' s-l for the reaction of OH radicals with propene, the principal reference organic compound, the rate constants (x1Ol2 cm3 molecule-' s-*) obtained for the acetates and esters used in this study are: Error limits represent 20 from linear least-squares analysis of data. A linear correlation was observed for a plot of the measured relative rate constants vs. the number of CH2 groups per molecule of the following acetates: methyl acetate, ethyl acetate, n-propyl acetate, butyl acetate, and pentyl acetate. 0

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The gas-phase reaction products of the OH radical with 2-ethoxyethyl acetate (EEA, CH3C (O]OCH,CH,0CH,CH3] have been investigated. I ,2-Ethanediol acetate forrnate [ EAF, CH,C(O)OCH,CH,OC(O)H) and ethyl formate (EF, HC[O)OCH,CH,) were identified as the two main products A third product, ethylene glycol diacetate (EGD,CH,C(0)OCH,CH,0C(O)CH3), was also observed EAF, EF, and EGD formation yields were determined to be 0.37 2 0.03 and 0 328 2 0.018 and 0 040 2 0 005, respectively. Proposed reaction mechanisms are discussed and compared with these data 0 1996

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