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• W2079428571 abstract "The reaction of the OH radical with dimethyl sulfide (DMS) and 2-(methylthio)ethanol (2-MTE) proceeds with the initial formation of a two-center−three-electron complex. In the gas phase the S−OH binding enthalpies (298 K) are 8.7 and 12.2 kcal/mol for DMS and 2-MTE, respectively. When entropy and aqueous solvation effects (via the CPCM method) are included, the free energies of association (298 K) of hydroxyl to DMS and 2-MTE become 3.0 and 3.2 kcal/mol, respectively. Calculations are based on DFT and/or MP2 optimizations and a G2-like method for evaluating energies. The most favorable (lowest free energy) conformation is often different between the gas phase and solution phase. Electron transfer from 2-MTE/2-MTE+ (1/1+) to OH/OH- has a positive free energy of 4.5 kcal/mol and is in competition with the acid-/base-catalyzed formation of CH3SCH2CH2O (2) plus water. The latter radical (2) undergoes intramolecular hydrogen transfer to form CH2SCH2CH2OH (3) or eliminates formaldehyde to form CH2SCH3+H2CO, where the free energy barriers are 7.9 and 8.3 kcal/mol, respectively. The 2-MTE cation (1+) can eliminate a C−H proton to form three different radicals that are within 2.0 kcal/mol of each other in free energy." @default.
• W2079428571 created "2016-06-24" @default.
• W2079428571 creator A5042558079 @default.
• W2079428571 date "2003-08-09" @default.
• W2079428571 modified "2023-10-05" @default.
• W2079428571 title "Comparison of Gas-Phase and Solution-Phase Reactions of Dimethyl Sulfide and 2-(Methylthio)ethanol with Hydroxyl Radical" @default.
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• W2079428571 doi "https://doi.org/10.1021/jp034704h" @default.
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