Products and Mechanism of the Reactions of OH Radicals and Cl Atoms with CH2=C(CH3)C(O)OCH3 in the presence of NOx

M. B. BLANCO, I. BEJAN, I. BARNES, P. WIESEN AND M. A TERUEL

ENVIRONMENTAL SCIENCE & TECHNOLOGY

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014 vol. 48 p. 1692 - 1692

0013-936X

he OH radical and Cl atom initiated photodegradation of methyl methacrylate has been investigated in a 1080 L quartz-glass environmental chamber at 298 +/- 2 K and atmospheric pressure of synthetic air using in situ FTIR spectroscopy to monitor the reactants and products. The major products observed in the OH reaction were methyl pyruvate (92 +/- 16) % together with formaldehyde (87 +/- 12) % as co-product from the C1-C2 bond cleavage channel of the intermediate 1,2-hydroxyalkoxy radical, formed by addition of OH to the terminal carbon of the double bond which is designated C1. For the Cl atom reaction the products identified were chloroacetone (41 +/- 6) % together with its co-product formaldehyde (35 +/- 5) % and methyl pyruvate (24 +/- 4) % together with its coproduct formylchloride (25 +/- 4) %. The results show that the fate of the intermediate 1,2-chloroalkoxy radical involves not only cleavage of the C1-C2 bond but also quite substantial cleavage of the C2-C3 bond. The prese