Gas-phase rate constants for the reaction of NO3 radicals with a series of cyclic alkenes, 2-ethyl-1-butene and 2,3-dimethyl-1,3-butadiene

The gas-phase reaction of NO3 radicals with selected cyclic alkenes has been studied in a flow system at 298±2 K at a total pressure of 6.8 mbar using helium as carrier gas. Rate constants obtained with the relative rate method were: cyclopentene, (3.78±0.47)×10−13; cyclohexene, (4.91±0.47)×10−13; cycloheptene, (5.42±0.23)×10−13; 1-methylcyclohexene, (1.03±0.08)×10−11; 1,2-dimethylcyclohexene, (5.15±0.34)×10−11; 2,3-dimethylcyclohexene, (1.54±0.23)×10−11; methylenecyclopropane, (1.38±0.23)×10−14; methylenecyclobutane, (4.21±0.39)×10−13; methylenecyclopentane, (1.52±0.13)×10−12; methylenecyclohexane, (5.38±0.70)×10−13; methylenecycloheptane, (1.01±0.13)×10−12; 3-methylenecyclohexene, (5.72±0.37)×10−12; α-pinene, (5.82±0.56)×10−12; and β-pinene, (2.81±0.56)×10−11 cm3 molecule−1 s−1. The corresponding rate constants for 2-ethyl-1-butene, (4.52±0.39)×10−13 and 2,3-dimethyl-1,3-butadiene, (1.37±0.15)×10−12 cm3 molecule−1 s−1, were determined. The errors (2σ) contain only the uncertainties from the obtained rate constant ratios.