Kinetics of the gas phase reactions of chlorine atoms with a series of ketones

Relative rate techniques were used to study the reactivity of Cl atoms with a series of ketones in 700 Torr of N2 or air diluent at 296 K. Rate constants were determined for: butanone, (4.04 ± 0.33) × 10−11; 2-pentanone, (1.11 ± 0.10) × 10−10; 3-pentanone, (8.10 ± 0.85) × 10−11; 2-hexanone, (1.88 ± 0.18) × 10−10; and 3-hexanone, (1.43 ± 0.19) × 10−10 cm3 molecule−1 s−1. The results for 2- and 3-pentanone and 2- and 3-hexanone are approximately a factor of 2–3 greater than reported from recent absolute rate studies. The likely origin of this discrepancy is discussed.