Atmospheric chemistry of hexafluorocyclobutene, octafluorocyclopentene, and hexafluoro-1,3-butadiene

The relative rate method was used to measure k(Cl + hexafluorocyclobutene) = (8.88 ± 0.69) × 10−13, k(Cl + octafluorocyclopentene) = (1.02 ± 0.11) × 10−12, k(Cl + hexafluoro-1,3-butadiene) = (7.28 ± 0.99) × 10−11, k(OH + hexafluorocyclobutene) = (8.6 ± 1.6) × 10−14, k(OH + octafluorocyclopentene) = (1.01 ± 0.16) × 10−13, and k(OH + hexafluoro-1,3-butadiene) = (9.64 ± 1.76) × 10−12 cm3 molecule−1 s−1 in 700 Torr N2, or air, diluent at 295 K. The atmospheric lifetimes of hexafluorocyclobutene, octafluorocyclopentene, and hexafluoro-1,3-butadiene were estimated to be 135, 104, and 1.1 days, respectively. The 100 year time horizon global warming potentials for hexafluorocyclobutene and octafluorocyclopentene are 42 and 28.