info:eu-repo/semantics/article
Photo-oxidation of Dimethyl Malonate Initiated by Chlorine Atoms in Gas Phase: Kinetics and Mechanism
Fecha
2017-10-25Registro en:
Rimondino, Guido Noé; Henao Arboleda, Diana Patricia; Peláez, Walter José; Argüello, Gustavo Alejandro; Malanca, Fabio Ernesto; Photo-oxidation of Dimethyl Malonate Initiated by Chlorine Atoms in Gas Phase: Kinetics and Mechanism; American Chemical Society; Journal of Physical Chemistry A; 121; 45; 25-10-2017; 8577–8582
1089-5639
1520-5215
CONICET Digital
CONICET
Autor
Rimondino, Guido Noé
Henao Arboleda, Diana Patricia
Peláez, Walter José
Argüello, Gustavo Alejandro
Malanca, Fabio Ernesto
Resumen
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.