Reaction of HO and DO with 2-vinylfuran

Abstract

The rate constants for the reactions of the hydroxyl radical, HO and DO, with 2-vinylfuran (k₁ and k₂) were measured at 295 ± 2 K using the method of pulsed laser photolytic generation of HO or DO, combined with pulsed laser induced fluorescence detection. For DO, mono-exponential decay profiles were observed, enabling a simple analysis to extract a value of k₂ = (8.8 ± 0.9) × 10⁻¹¹ cm³ molecule⁻¹ s⁻¹. In contrast, the decay of HO was complex, due to its regeneration in secondary reactions, and was analysed using a multi-exponential expression that enabled a rate constant of k₂ = (9.0 ± 1.0) × 10⁻¹¹ cm³ molecule⁻¹ s⁻¹ to be extracted. The different behaviour of HO and DO provides clues to the reaction mechanism, which involves ring opening and a rearrangement/HO-elimination step. As part of this work the UV-absorption spectrum of 2-vinylfuran is also reported.