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- W2109677946 abstract "Abstract Thermodynamic and kinetic data in the temperature range 300–1500 K are calculated for 94 homolytic substitution reactions by a hydrogen atom at thiols and sulfides with the CBS‐QB3//BMK/6‐311G(2d,d,p) method. The studied reactions were found to proceed according to a one‐step mechanism. A group additivity (GA) method is presented to model the Arrhenius parameters of this reaction family. The required GA values were derived from data obtained for a set containing 58 reactions. By using the developed GA scheme, rate coefficients at 300 K for 26 substitution reactions by the hydrogen atom are reproduced within a factor of 2.2. Mean absolute deviations on the activation energy and pre‐exponential factor are limited to 1.1 kJ mol −1 and 0.19, respectively. Rate coefficients for the reverse reactions, that is, substitution reactions by C‐ and S‐centered radicals with expulsion of a hydrogen atom, are reproduced within a factor of 6 by using thermodynamic consistency. At 1000 K, group additive and calculated rate coefficients for the forward and reverse reactions agree within a factor of 1.8 and 4, respectively. Experimental rate coefficients in the temperature range 300–400 K are reproduced within a factor of 5. Discrepancies between calculated and experimental data are discussed." @default.
- W2109677946 created "2016-06-24" @default.
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- W2109677946 date "2013-04-15" @default.
- W2109677946 modified "2023-10-16" @default.
- W2109677946 title "Kinetics of Homolytic Substitutions by Hydrogen Atoms at Thiols and Sulfides" @default.
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- W2109677946 doi "https://doi.org/10.1002/cphc.201201049" @default.
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