Photochemical Properties of CH₂CH-CFCl-CF₂Br (4-Bromo-3-chloro-3,4,4-trifluoro-1-butene) and CH₃‑O-CH(CF₃)₂ (Methyl Hexafluoroisopropyl Ether): OH Reaction Rate Constants and UV and IR Absorption Spectra

Rate constants for the reactions of hydroxyl radicals (OH) with 1,1,1,3,3,3-hexafluoroisopropyl methyl ether (CH₃-O-CH­(CF₃)₂) and 4-bromo-3-chloro-3,4,4-trifluoro-1-butene (CH₂CH-CFCl-CF₂Br) have been measured over the temperature range 230–370 K to give the following Arrhenius expressions: k_CH3OCH(CF3)2(T) = 7.69 × 10^–14 × (T/298)^2.99 × exp­(+342/T), cm³ molecule^–1 s^–1, and k_{CH2CHCFClCF2Br}(T) = (6.45 ± 0.72) × 10^–13 × exp­{+(424 ± 32)/T}, cm³ molecule^–1 s^–1. Atmospheric lifetimes of compounds were estimated to be 67 days and 4.5 days, respectively. UV absorption spectrum of CH₂CH-CFCl-CF₂Br between 164 and 260 nm and IR absorption spectra of both compounds between 450 and 1600 cm^–1 were measured at room temperature.