Effect of ionic strength on the formation of diethyl(1S, 2S)-3,3 dibenzoylcyclopropane-1,2 dicarboxylate:A kinetics and mechanism study
محل انتشار: بیستمین کنفرانس شیمی فیزیک ایران (IPCC۲۰)
سال انتشار: 1396
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 385
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شناسه ملی سند علمی:
ISPTC20_237
تاریخ نمایه سازی: 2 تیر 1397
چکیده مقاله:
In this study, the kinetics and mechanism of the reaction between diethyl acetylenedicarboxylate anddibenzoylmethane has been studied in the presence of triphenylarsine as a catalyst with respect to the concentration,solvent, temperature, ionic strength, surfactant and structure. To detect the effect of ionic strength on the reaction ratesome salts was used.The best performance was in the presence of potassium iodide salt that rate of the reaction was 6.8-fold faster. Moreover, the effect of cationic, nonionic and anionic surfactants on the reaction rate was investigated thatanionic surfactant (sodium dodecylsulfate) has the significant decrease on the rate of the reaction. The kinetic data wereprovided the reaction order, kinetics values (kovr and Ea), activation parameters (ΔH≠, ΔS≠and ΔG≠), the ratedeterminingstep (RDS) and the proposed mechanism.
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نویسندگان
F Mahmoudi
Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
S.M HabibiKhorassani
Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
M Shahraki
Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran