title: Theoretical study on the gas phase reaction of propargyl alcohol with hydroxyl radical.
abstract: The reaction of propargyl alcohol with hydroxyl radical has been studied extensively at CCSD(T)/aug-cc-pVTZ//MP2/cc-pVTZ level. This is the first time to gain a conclusive insight into the reaction mechanism and kinetics for this important reaction in detail. Two reaction mechanisms were revealed, namely addition/elimination and hydrogen abstraction mechanism. The reaction mechanism confirms that OH addition to C≡C triple bond forms the chemically activated adducts, IM1 (·CHCOHCH2OH) and IM2 (CHOH·CCH2OH), and the hydrogen abstraction pathways (-CH2OH bonded to the carbon atom and alcohol hydrogen) may occur via low barriers. Harmonic model of Rice-Ramsperger-Kassel-Marcus theory and variational transition state theory are used to calculate the overall and individual rate constants over a wide range of temperatures and pressures. The calculated rate constants are in good agreement with the experimental data. At atmospheric pressure with Ar as bath gas, IM1 (·CHCOHCH2OH) and IM2 (CHOH·CCH2OH) formed by collisional stabilization are dominant in the low temperature range. The production of CHCCHOH + H2O via hydrogen abstraction becomes dominate at higher temperature. The fraction of IM3 (CH2COHCH2·O) is very significant over the moderate temperature range.
authors.affiliation: Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Renmin Road 5268, Changchun, Jilin, 130024, People's Republic of China.
authors.forename: Yunju
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jingyu
authors.initials: J
authors.lastname: Sun
authors.forename: Wanqiao
authors.initials: W
authors.lastname: Zhang
authors.forename: Yizhen
authors.initials: Y
authors.lastname: Tang
authors.forename: Rongshun
authors.initials: R
authors.lastname: Wang
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D008956:Models, Chemical; D020005:Propanols / Q000737:chemistry*
chemical_list: D000480:Alkynes; D005740:Gases; D020005:Propanols; D017665:Hydroxyl Radical; C028255:propargyl alcohol
keywords: OH radical; propargyl alcohol; rate constants; reaction mechanism