Rate constants have been determined for the reactions of SO4with a series of alkanes and ethers. The SO, radical was produced by the laser-flash photolysis of persulfate, SZO: -. For methane, only an upper limit of 1 x lo6 M-' s-\* could be determined. For ethane, propane, and 2-methylpropane, rate
Rate constants for some hydrogen abstraction reactions of the carbonate radical
โ Scribed by Carol L. Clifton; Robert E. Huie
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 243 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0538-8066
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โฆ Synopsis
Rate constants have been measured in aqueous solutions for the reactions of the carbonate radical, COs'-, with several saturated alcohols and one cyclic ether as a function of temperature.
Arrhenius pre-exponential factors ranged from 2 X lo8 to 1 X lo9 e mol-' s-l and activation energies ranged from 16 to 29 kJ mol-'. The results suggest that the reactions are not pure hydrogen abstraction, but involve an additional interaction of the radical with the -OH or -0 -linkage.
๐ SIMILAR VOLUMES
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The gas phase photolysis of CP3CC13 in the presence of scveral alkanes has been used to obtain Arrhenius parameters for the abstraction of hydrogen atoms by the CF3CC12 radical : CFBCCI~ + RH -+ CF3CC12H + R Activation energies of 9.6 and 8.0 kcal/mole are found for abstraction from secondary and te
Absolute rate constants have been measured for the reactions of trichloromethylperoxyl radicals with cyclohexane, cyclohexene, and hexamethylbenzene. The CClsO, radicals were produced by pulse radiolysis of air-saturated CCl, solutions containing various amounts of the hydrocarbons. The rate constan
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An important step in the initial oxidation of hydrocarbons at low to intermediate temperatures is the abstraction of H by hydroperoxyl radical (HO(2)). In this study, we calculate energy profiles for the sequence: reactant + HO(2) โ [complex of reactants] โ transition state โ [complex of products] โ