title: Kinetics and products of the OH radical-initiated reaction of 1,4-butanediol and rate constants for the reactions of OH radicals with 4-hydroxybutanal and 3-hydroxypropanal.
abstract: Rate constants for the gas-phase reactions of the OH radical with 1,4-butanediol,4-hydroxybutanal, and 3-hydroxypropanalwere measured at 298 +/- 2 K and atmospheric pressure using a relative rate technique and with 4-hydroxybutanal and 3-hydroxypropanal being formed in situ from the OH + 1,4-butanediol reaction, and were (in units of 10(-11) cm(3) molecule(-1) s(-1)) 3.67 +/- 0.31, 3.0(-1.0)(+1.5), and 3.5(-1.0)(+1.3), respectively, with the latter being a lower limit because of the possibility of second-generation formation of 3-hydroxypropanal from OH + 4-hydroxybutanal. The measured formation yields of 4-hydroxybutanal and 3-hydroxypropanal from the OH + 1,4-butanediol reaction in the presence of NO were 58 +/- 19% and 55 +/- 12%, respectively. In addition to the formation of 4-hydroxybutanal and 3-hydroxypropanal, gas chromatography-mass spectrometric analyses of reacted OH + 1,4-butanediol reactionsshowedformation of glycolaldehyde [HOCH(2)CHO], malonaldehyde [HC(O)CH2CHO], and 1,4-butanedial [HC(O)CH(2)CH(2)CHO]. Glycolaldehyde, malonaldehyde, and 1,4-butanedial are expected products of the reaction of OH radicals with 4-hydroxybutanal, and glycolaldehyde and malonaldehyde are expected products of the reaction of OH radicals with 3-hydroxypropanal. Reaction mechanisms are presented and discussed.
authors.affiliation: Air Pollution Research Center, University of California, Riverside, California 92521, USA. mason@fredonia.edu
authors.forename: Sherri A
authors.initials: SA
authors.lastname: Mason
authors.forename: Janet
authors.initials: J
authors.lastname: Arey
authors.forename: Roger
authors.initials: R
authors.lastname: Atkinson
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000440:Butanols / Q000737:chemistry*; D002072:Butylene Glycols / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D007700:Kinetics; D015394:Molecular Structure
chemical_list: D000393:Air Pollutants; D000440:Butanols; D002072:Butylene Glycols; D017665:Hydroxyl Radical; C039681:1,4-butanediol