6806-86-6Relevant articles and documents
Temperature dependence of the kinetic isotopic effect of the reaction of Cl atoms with C2H5Cl between 298 and 550 K
Sarzyński, Dariusz,Gola, Agnieszka A.,Brudnik, Katarzyna,Berkowski, Ryszard,Jodkowski, Jerzy T.
, p. 20 - 26 (2013/01/15)
The kinetics of the gas-phase reactions of chlorine atoms with chloroethane and chloroethane-d5 was studied experimentally. The relative rate method was applied using Cl + CH3Cl as the reference reaction. The overall rate constants for H-abstraction from C2H5Cl (kH), D-abstraction from C2D5Cl (k D), the site-specific rate constants for H-abstraction from α-carbon (kH,α) and β-carbon (kH,β) atoms of C2H5Cl were measured in the temperature range of 298-550 K at a total pressure of 100 Torr. The derived temperature dependencies of the rate constants are given by kH = (2.41 ± 0.21) × 10-11 × exp(-316 ± 11/T), kH,α = (1.36 ± 0.09) × 10-11 × exp(-202 ± 8/T), k H,β = (1.14 ± 0.11) × 10-11 × exp(-592 ± 16/T) and kD = (1.58 ± 0.14) × 10 -11 × exp(-474 ± 13/T) cm3 molecule -1 s-1. The values of the kinetic isotope effect, k H/kD were also estimated.
Kinetics of reactions of CN with chlorinated methanes
Samant, Vaishali,Hershberger, John F.
experimental part, p. 64 - 67 (2009/02/04)
The kinetics of reactions of CN with the chlorinated methanes CH3Cl, CH2Cl2, CHCl3 and CCl4 were investigated over the temperature range 298-573 K, using laser induced fluorescence (LIF) spectroscopy. At 298 K, rate constants of 9.0 ± 0.3 × 10-13, 8.8 ± 0.4 × 10-13, 9.0 ± 0.5 × 10-13 and 4.3 ± 0.6 × 10-13 cm3 molecule-1 s-1 were measured, respectively. A small positive temperature dependence was observed, as well as kinetic isotope effects of kH/kD ～ 2.14-2.25. These data along with product detection experiments strongly suggest that hydrogen abstraction dominates these reactions.
Adiabatic and diabatic dynamics in the photodissociation of CH2BrCl
Zou,McGivern,North
, p. 3785 - 3790 (2007/10/03)
The photodissociation dynamics of chlorobromomethane (CBM) were investigated between 193 and 242 nm by resonance-enhanced multiphoton ionization (REMPI) with time-of-flight mass spectrometry (TOFMS). Translational energy distributions, anisotropy parameters, and Br: Br(*) branching ratios were determined at 193 and 235 nm to explore the non-adiabatic dynamics near the avoided crossing. Additional measurements were made at intermediate wavelengths to characterize the wavelength dependence of the Br and Br(*) anisotropy parameters. The non-adiabatic crossing probabilities calculated by applying a one-dimensional Landau-Zener model were relatively insensitive to the excitation wavelength, indicating that the avoided crossing between 3A' and 4A' potentials lies in the exit channel. Additionally, we have determined the partial absorption cross sections for the excited states that contribute to the ultraviolet absorption spectrum of CBM.
Evidences for the generation of α-alkoxy and α-alkylthioalkyl radicals upon reduction of α-functionalized alkyl phenyl sulfones. Investigation of the reduction mechanism by electrochemistry
Amatore, C.,Bayachou, M.,Bontejengout, F.,Verpeaux, J. N.
, p. 371 - 381 (2007/10/02)
The mechanism of single electron transfer reduction of α-halo-, α-alkoxy-, or α-alkylthioalkyl phenyl sulfones is investigated using cyclic or steady-state voltammetry.This study provides strong evidence that some of these sulfones can be used to generate free radicals at potentials at which they cannot be reduced.Further confirmation is obtained by indirect electrolysis.Finally, redox catalysis allows determination of standard potentials and cleavage rate constants for most of the sulfone radical anions.Keywords: sulfones / single electron transfer / electrochemical reduction / alkoxyalkyl radicals / alkylthioalkyl radicals
