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• W2528333351 abstract "Chemically activated C2D5CHCl2 molecules were generated with 88 kcal mol–1 of vibrational energy by the recombination of C2D5 and CHCl2 radicals in a room temperature bath gas. The competing 2,1-DCl and 1,1-HCl unimolecular reactions were identified by the observation of the CD3CD═CHCl and CD3CD═CDCl products. The initial CD3CD2C—Cl carbene product from 1,1-HCl elimination rearranges to CD3CD═CDCl under the conditions of the experiments. The experimental rate constants were 2.7 × 107 and 0.47 × 107 s–1 for 2,1-DCl and 1,1-HCl elimination reactions, respectively, which corresponds to branching fractions of 0.84 and 0.16. The experimental rate constants were compared to calculated statistical rate constants to assign threshold energies of 54 and ≈66 kcal mol–1 for the 1,2-DCl and 1,1-HCl reactions, respectively. The statistical rate constants were obtained from models developed from electronic-structure calculations for the molecule and its transition states. The rate constant (5.3 × 107 s–1) for the unimolecular decomposition of CHCl2CHCl2 molecules formed with 82 kcal mol–1 of vibrational energy by the recombination of CHCl2 radicals also is reported. On the basis of the magnitude of the calculated rate constant, 1,1-HCl elimination must contribute less than 15% to the reaction; 1,2-HCl elimination is the major reaction and the threshold energy is 59 kcal mol–1. Calculations also were done to analyze previously published rate constants for chemically activated CD2ClCHCl2 molecules with 86 kcal mol–1 of energy to obtain a better overall description of the nature of the 1,1-HCl pathway for 1,1-dichloroalkanes. The interplay of the threshold energies for the 2,1-HCl and 1,1-HCl reactions and the available energy determines the product branching fractions for individual molecules. The unusual nature of the transition state for 1,1-HCl elimination is discussed." @default.
• W2528333351 created "2016-10-14" @default.
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• W2528333351 date "2016-10-18" @default.
• W2528333351 modified "2023-09-27" @default.
• W2528333351 title "Chemical Activation Study of the Unimolecular Reactions of CD₃CD₂CHCl₂ and CHCl₂CHCl₂ with Analysis of the 1,1-HCl Elimination Pathway" @default.
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• W2528333351 doi "https://doi.org/10.1021/acs.jpca.6b07368" @default.
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