The hydroxyl radical reaction rate constant and products of ethyl 3-ethoxypropionate

✍ Scribed by J. Steven Baxley; Michael V. Henley; J. R. Wells

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 165 KB
• Volume: 29
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1997)29:8<637::aid-kin9>3.0.co;2-v

✦ Synopsis

The relative rate technique has been used to measure the hydroxyl radical (OH) reaction rate constant of ethyl 3-ethoxypropionate (EEP, CH 3 CH 2 -O -CH 2 CH 2 C(O)O -CH 2 CH 3 ). EEP reacts with OH with a bimolecular rate constant of (22.9 Ϯ 7.4) ϫ 10 Ϫ12 cm 3 molecule Ϫ1 s Ϫ1 at 297 Ϯ 3 K and 1 atmosphere total pressure. In order to more clearly define EEP's atmospheric reaction mechanism, an investigation into the OH ϩ EEP reaction products was also conducted. The OH ϩ EEP reaction products and yields observed were: ethyl glyoxate (EG, 25 Ϯ 1% HC( " O)C( " O) -O -CH 2 CH 3 ), ethyl (2-formyl) acetate (EFA, 4.8 Ϯ 0.2%, HC( " O) -CH 2 -C( " O) -O -CH 2 CH 3 ), ethyl (3-formyloxy) propionate (EFP, 30 Ϯ 1%, HC( " O) -O -CH 2 CH 2 -C( " O) -O -CH 2 CH 3 ), ethyl formate (EF, 37 Ϯ 1%, HC( " O)O -CH 2 CH 3 ), and acetaldehyde (4.9 Ϯ 0.2%, HC( " O)CH 3 ). Neither the EEP's OH rate constant nor the OH/EEP reaction products have been previously reported. The products' formation pathways are discussed in light of current understanding of oxygenated hydrocarbon atmospheric chemistry.