title: Free radical induced degradation of 1,2-dibromoethane. Generation of free Br. atoms.
abstract: Free Br. atoms have been found to be generated upon eaq- and .OH radical induced degradation of 1,2-dibromoethane in aqueous solution. The relevant process is beta-bromine cleavage from CH2BrCH2 and CH2BrCHBr radicals, respectively. An absolute rate constant of k = 2.8 x 10(6) s-1 has been determined for the reaction CH2BrCH2----Br. + CH2 = CH2, while an estimate of k approximately 10(6) s-1 can be given for CH2BrCHBr----Br. + CH2 = CHBr. The Br. atoms have been identified through their reaction with Br- to Br2-. (k = 7.7 x 10(9) mol-1dm3s-1) and their reaction with 2,2'-azinobis (3-ethylbenzthiazoline-6-sulphonate) (k = 6.8 x 10(9) mol-1dm3s-1). Ethylene and vinyl bromide have been identified via GC. The results substantiate earlier findings that free radical induced mechanisms can serve as informative probe for metabolic processes.
authors.affiliation: Hahn-Meitner-Institut für Kernforschung Berlin, Federal Republic of Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lal
authors.forename: J
authors.initials: J
authors.lastname: Mönig
authors.forename: K D
authors.initials: KD
authors.lastname: Asmus
mesh_terms: D001966:Bromine; D015946:Ethylene Dibromide; D005609:Free Radicals; D006842:Hydrocarbons, Brominated
chemical_list: D005609:Free Radicals; D006842:Hydrocarbons, Brominated; D015946:Ethylene Dibromide; D001966:Bromine