Kinetics Of Diels-Alder Reaction In Microemulsion

Kinetics of Diels-Alder Reaction of N-ethymaleimide with1,3-Cycloexadiene and hetero-Diels-Alder reaction of Nitrosobenzene with2,3-Dimethyl-1,3-butadiene in the H2O/AOT/Isooctane were studied by spectroscopic analysis method in this thesis. In the microemulsion the effect of reaction temperature, the AOT concentration and molar ratio of water to AOT (ω) on the Diels-Alder reaction was investigated and the results were interpreted.The Diels-Alder Reaction rate of N-ethymaleimide with1,3-Cycloexadiene in the oil-in-water micromulsion were faster than that in the pure isooctane, and the molar ratio of microemulsion (ω) can control the reaction rate, along with the increase of ω, the reaction rate increase. The rate constants (ω) increase with the reaction temperature and AOT concentration in the microemulsion. It is means that the Diels-Alder Reaction of N-ethymaleimide with1,3-Cycloexadiene occurred on the interface of oil and water in the microemulsion.And for Hetero-Diels-Alder reaction of Nitrosobenzene with2,3-Dimethyl-1,3-butadiene in micromulsion, we choose the same experimental method:three factors (T (temperature), the concentration of AOT and ω) about the Hetero-Diels-Alder Reaction kinetics parameters was investigated, but the experimental results is very different. The results of the study show that:along the increasing of concentration of AOT and ω, The second order rate constant ω in the microemulsion compared with in the pure Isooctane were not obvious difference even slightly lower.Comparison of two Diels-Alder and Hetero Diels-Alder reaction in the microemulson, in response to control the reaction rate through the microemulsion should have the following conditions:1) reaction occurred on the oil-water interface;2) the poor solubility of reactants and products in the oil phase or water phase.