US EPA

4923463 

Journal Article 

Photo-oxidation of dimethyl malonate initiated by chlorine atoms in gas phase: Kinetics and mechanism 

Rimondino, GN; Henao, DP; Peláez, WJ; Argüello, GA; Malanca, FE 

2017 

Yes 

Journal of Physical Chemistry A
ISSN: 1089-5639
EISSN: 1520-5215 

121 

45 

8577-8582 

English 

29067806 

10.1021/acs.jpca.7b06595 

WOS:000416203500004 

The rate coefficient for the gas-phase reaction of chlorine atoms with dimethyl malonate (DMM, CH3OC(O)CH2C(O)OCH3) was determined at 298 K using relative methods giving a value of (3.8 ± 0.4) × 10-12, cm3 molecule-1 s-1). The photo-oxidation mechanism of DMM was also investigated. The main products were identified by infrared spectroscopy, and computational calculations were performed in order to support the experimental data. The results reveal that the photo-oxidation occurs mainly by the abstraction of an H atom from the methyl groups. The CH3OC(O)CH2C(O)OCH2O• radical formed subsequently reacts according to three competitive paths: reaction with molecular oxygen to yield CH3OC(O)CH2C(O)OC(O)H, isomerization-unimolecular decomposition to lead finally to CH3OC(O)C(O)H, CO2, and HC(O)OH, and α-ester rearrangement to form monomethyl malonate and carbon monoxide. The yield of products as a function of oxygen pressure was also determined.