This reaction is typically carried out in the presence of a catalyst, such as a peroxide or a radical initiator,to initiate the reaction and increase the reaction rate. The catalyst helps to generate radicals, which can then react with the ethylene and HBr molecules to initiate the addition re...
关键词:丙烯;溴自由基;自由基加成;自由基取代;竞争关系中图分类号:O6;G64MechanismsandCompetitionofFreeRadicalAdditionandSubstitutionReactionsofPropylenewithHBrandBr·CHENYong*(DepartmentofAppliedChemistry,ShandongUniversityofScienceandTechnology,Qingdao266590,ShandongProvince,P.R.China)Abstract:Alkeneswithα-Hcanreac...
Interactive 3D animations of reaction mechanism of HBr addition to unsymmetrical alkenes for students studying University courses
The kinetics of the acetone-sensitized photoaddition of HBr to ethylene are consistent with the free radical chain mechanism of Vaughan, Rust, and Evans. In the presence of excess propane the combination of bromine atoms (reaction [4]) is the main termination step, and bromoethyl radicals ...
Figure 5. The integral cross sections of j2 = 0) as a function of the translational the reaction energy. HBr (v1 = 0, j1) for j1 = 0, 1, 2, 3, 4 with OH (v2 = 0, Rotational excitations ICSs. In addition, we also studied the rotational excitations ...
Click the structures and reaction black arrows in sequence to view the 3D models and animations respectively NOTE: Important charges and non-bonding electrons are shown throughout the animation except during the transition state phase. The two termination steps shown are representative of radical ...
The fast flow method with laser induced fluorescence detection of CH3C(O)CH2 was employed to obtain the rate constant of k 1 (298 K) = (1.83 卤 0.12 (1)) 脳 1010 cm3 mol-1 s-1 for the reaction CH3C(O)CH2 + HBr CH3C(O)CH3 + Br (1, -1). The observed reduced reactivity ...
NakamuraM.LinK. C.KasaiT.PHYSICAL CHEMISTRY CHEMICAL PHYSICS -CAMBRIDGE- ROYAL SOCIETY OF CHEMISTRYTsai, P. -Y.; Che, D. -C.; Nakamura, M.; Lin, K. -C.; Kasai, T. "Orientation dependence for Br formation in the reaction of oriented OH radical with HBr molecule" Phys. Chem. Chem...
Pulsed laser photolysis coupled with time-resolved UV-absorption monitoring of CH 3 CO radicals was applied to obtain the rate constant, k 1 , for the reaction CH 3 CO + HBr → CH 3 C(O)H + Br (1); k 1 (298 K) = (3.59 ± 0.23 (2σ))x10 -12 cm 3 molecule -1 s -1 ....