The hydroxyl radical reaction rate constant and products of methyl isobutyrate

✍ Scribed by S. E. Wyatt; J. S. Baxley; J. R. Wells

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 142 KB
• Volume: 31
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1999)31:8<551::aid-kin4>3.0.co;2-c

✦ Synopsis

The relative rate technique has been used to measure the rate coefficient for the reaction of the hydroxyl radical (OH) with methyl isobutyrate (MIB, (CH 3 ) 2 CHC(ϭO)-O-CH 3 ) to be (1.7 Ϯ 0.4) ϫ 10 Ϫ12 cm 3 molecule Ϫ1 s Ϫ1 at 297 Ϯ 3 K and 1 atmosphere total pressure. To more clearly define MIB's atmospheric degradation mechanism, the products of the OH ϩ MIB reaction were also determined. The observed products and their yields were: acetone (97 Ϯ 1%, (CH 3 ) 2 C(ϭO)) and methyl pyruvate (MP, 3.3 Ϯ 0.3%, CH 3 C(ϭO)C(ϭO)-O-CH 3 ). The products' formation pathways are discussed in light of current understanding of the atmospheric chemistry of oxygenated organic compounds.