Rate constants for the reaction of OH radicals with n-propyl, n-butyl, iso-butyl and tert-butyl vinyl ethers

Rate constants for the reaction of OH radicals with n-propyl vinyl ether (PVE, CH3CH2CH2OCH CH2), n-butyl vinyl ether (BVE, CH3CH2CH2CH2OCH CH2), iso-butyl vinyl ether (IBVE, (CH3)2CHCH2OCH CH2) and tert-butyl vinyl ether (TBVE, (CH3)3COCH CH2), have been measured in the temperature and pressure ranges 232–373 K and 30–300 Torr using the pulsed laser photolysis-laser-induced fluorescence method, and at 298 K and 760 Torr using the relative method. The obtained results are k1=(9.3±0.6)×10−12 exp[(708±20)/T], k2=(1.5±0.2)×10−11 exp[(572±42)/T], k3=(1.6±0.1)×10−11 exp[(567±20)/T], k4=(1.7±0.2)×10−11 exp[(549±25)/T] cm3 molecule−1 s−1. The values at 298 K are k1=(1.0±0.1)×10−10, k2=(1.0±0.1)×10−10, k3=(1.1±0.1)×10−10, k4=(1.1±0.1)×10−10 cm3 molecule−1 s−1. The deduced tropospheric lifetimes of these ethers for reaction with OH are of the order of 1 h and they are comparable to those for reaction with ozone.