Sadegh Talaeifar - Department of Chemistry, University of Sistan and Baluchestan, P.O. Box ۹۸۱۳۵-۶۷۴, Zahedan, Iran
Sayyed Mostafa Habibi-Khorasani - Department of Chemistry, University of Sistan and Baluchestan, P.O. Box ۹۸۱۳۵-۶۷۴, Zahedan, Iran
Mehdi Shahraki - Department of Chemistry, University of Sistan and Baluchestan, P.O. Box ۹۸۱۳۵-۶۷۴, Zahedan, Iran
Halime kord-Tamandani - Department of Chemistry, University of Sistan and Baluchestan, P.O. Box ۹۸۱۳۵-۶۷۴, Zahedan, Iran

In the present work, the kinetics and mechanism of the reaction among dimethyl acetylendicarboxcylate (DMAD), Thiazolidine-2, 4-dione (TZD) and triphenylarsine (TPA) as a catalyst was conducted in the methanol solvent using UV/vis spectrophotometry technique, for the generation of 2-Pyrrolidin-1-yl-but-2-enedioic acid dimethyl ester [1]. Increasing the reaction rate with the lowest cost can be an extra large challenge. Accordingly, the effect of different salts on the reaction rate [2] were considered. Enhancing the polarity of the solvent from ethanol (ε = 24.5) to methanol (ε = 32.7) increased the reaction rate about five times but the addition of salts to the solution has a much stronger effect on the reaction rate. The reaction rate among DMAD, TZD and TPA in the methanol solvent with salt content is about 68.5 times higher than the reaction rate [2] in the absence of salt. Activation energy (Ea= 25.74kJ.mol-1) and its related parameters were determined (ΔH‡ = 23.39 J.mol-1, ΔS‡ = -175.59 J.mol-1K-1, ΔG‡ = 75.83 kJ.mol-1). And associative mechanism, chemically and enthalpy-controlled being of the reaction documented. Pursuant to the effect of changing the reaction medium by temperature, solvent and salt step4 recognized as RDS [3]. The overall order of the reaction was two, and partial orders of reactants DMAD and TZD were one and one, respectively. Also, the order of catalyst (TPA) was experimentally determined to be one.

Inorganic salts effect, triphenylarsine, kinetics and DMAD