Theoretical illustration of the effect of 1-ethyl-pyridinium trifluoroacetate ionic liquid in the enhancement of the Diels–Alder reaction of isoprene with acrylic acid

Chemouri, Hafida; Mekelleche, Sidi Mohamed

doi:10.1186/1758-2946-6-s1-p58

Cited by 2 publications

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“…In our work and in order to take into consideration the hydrogen bonding caused by IL and organic solvents, we have used a simple model based on the coordination of one molecule of the solvent with the dienophile, with the transition states (TSs) and with the cycloadducts (CAs). A preliminary report of this study has been presented at a conference [39].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation of the Kinetic Effect of the 1-Ethylpyridinium Trifluoroacetate Ionic Liquid in the Acceleration of Diels–Alder Reactions of Isoprene with Acrylic Acid and Acrylonitrile

Chemouri

Mekelleche

2017

Progress in Reaction Kinetics and Mechanism

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The mechanism, the regioselectivity, the stereoselectivity and the kinetics of Diels–Alder reactions of isoprene with acrylic acid and acrylonitrile have been studied, at the B3PW91/6-31G(d,p) level of theory, both in the gas phase and in the presence of organic [dichloromethane (DCM)] and ionic liquid [1-ethylpyridinium trifluoroacetate (EPTFA)] solvents. Intrinsic reaction coordinate calculations show that these reactions take place through an asynchronous concerted mechanism leading to the endo para cycloadducts as the major products in the gas phase and to the exo para cycloadducts as the major products both in organic and in ionic liquid solvents. The explicit solvation model involving the coordination of one molecule of the solvent with the dienophiles shows a considerable decrease of the activation energy when passing from DCM to EPTFA. The enhancement of these cycloaddition reactions can be explained by the strong hydrogen bonding created between the ion pair of the ionic liquid and the oxygen atom of the dienophile reagents. Moreover, density functional theory-based reactivity indices also show an increase of the reaction polarity and consequently of the reaction rate, when replacing DCM solvent by EPTFA solvent. The results obtained give evidence that the ionic liquid EPTFA is an excellent solvent for Diels–Alder reactions in comparison with conventional organic solvents.

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Section: Introductionmentioning

confidence: 99%