Absolute rate coefficients for the reaction between nitrate radicals and some cyclic alkenes

Abstract

Absolute rate coefficients for the reaction between NO₃ and cyclopentene, cyclohexene and 1-methylcyclohexene have been determined to be (5.9 ± 1.1)× 10^–13(295 K), (6.3 ± 1.3)× 10^–13(294 K) and (1.5 ± 0.5)× 10^–11(293 K)(units of cm³ molecule^–1 s^–1), respectively, using the fast-flow–discharge technique. The activation energies for the NO₃+ cyclohexene and 1-methylcyclohexene reactions were 1 ± 4 and 0 ± 5 kJ mol^–1. The simple cyclic alkenes react slightly faster than (Z)-but-2-ene which contains a similar active structural element. The rate coefficient for reaction with 1-methylcyclohexene is close to that for Δ³-carene or 2-carene but significantly greater than for α-pinene.