Study On Kinetics For Synthesis Of Methyl Dihydrojasmonate

Dihydro jasmonate (Methyl Dihydrojasmonate, MDJ) is a very important organic chemical raw materials, because of its excellent characteristics in many aspects of life wash additives, cosmetics, pesticides have a wide range of use.In this paper, Valeraldehyde, cyclopentanone, methyl acetate as the raw material, the use of microwave-assisted method, synthesized dihydro jasmonate. Through single factor experiments investigate the effects of various factors on the synthesis process dihydro-methyl jasmonate studied alkaline reagent consumption (ester base molar ratio), raw material ratio (molar ratio), reaction temperature, reaction time on Michael the impact of the addition reaction, in order to determine a more optimized process parameters, the experimental results obtained:Mai alkaline agent in an amount of LDA LDA:acetate=1:5, the ratio of raw materials for the n (methyl acetate):n (within ketone)= 2.5:1, reaction temperature T=-5℃, reaction time t=2h, using the optimized process parameters dihydro jasmonate synthesis yield has improved, conditions improved only shorten the reaction time, reducing the amount of raw materials, but also has mild reaction conditions, the advantages of easy operation. The product was characterized proves that the product was methyl dihydro jasmonate target product.Isothermal method studied experimentally apparent kinetics Michael addition reaction system, the experimental determination of the yield of the reaction product of the synthetic system at different times, by establishing a dynamic model can be obtained relatively accurately described under the experimental conditions the yield with reaction time, reaction temperature and other changes in the chemical reaction rate equation, and get the kinetic model parameters. Through kinetic experiments, the researchers dihydro jasmonate synthesis reaction at -10℃,-5℃, the chemical reaction equation at 0℃ temperature conditions, through data analysis and calculation, in this experimental condition, and methyl acetate within one Michael addition reaction obedience second kinetics. Further, by selecting the test temperature range tested to verify the accuracy of the resulting reaction rate equation for further research dihydro jasmonate provides the basis basis.Through single factor experiment to determine the optimal parameters dihydro jasmonate and choose to do the third step reaction kinetics using the initial kinetic experiments kinetic data obtained Michael addition reaction under the experimental conditions of temperature rate equation. There is no kinetic studies at home and abroad dihydro jasmonate, and provides a basis for further exploration process.