Atmospheric chemistry of 1,1-difluoroacetone, CHF2C(O)CH3: Kinetics, products and mechanisms of the Cl atom and OH radical initiated oxidation

Smog chamber techniques were used to study the Cl atom and OH radical initiated oxidation of 1,1-difluoroacetone (CF2HC(O)CH3) in 700 Torr of air or N2 diluent at 297 K. Using relative rate methods k(Cl + CF2HC(O)CH3) = (5.0 +/- 0.8) x 10-14 cm3 molecule-1 s-1 and k(OH + CF2HC(O)CH3) = (2.6 +/- 0.7) x 10-14 cm3molecule- 1s- 1 were determined. The atmospheric lifetime of CF2HC(O)CH3 with respect to reaction with OH radicals is estimated at 1.2 years. Atmospheric oxidation yields COF2 , CO and CO2. The data suggests that Cl atoms primarily attack the -CF2H group, whereas OH radicals also attack the -CH3 group.