Abstract
Kinetic data of the cyclohexene hydroxymethoxycarbonylation catalyzed by bis(triphenylphosphine) palladium Pd(PPh3)2 were processed and considered on the basis of the quantum-chemical calculations. By the method of density functional DFT PBE/3z we found that among the possible catalyst moleculs based on the tetrakis(triphenylphosphine)palladium the most stable is Pd(PPh3)2 with the coordination number of palladium equal 2. The interaction energy of Pd(PPh3)2 with acetone, acetonitrile, dichloroethane, 1,4-dioxane, nitromethane, and tetrahydrofuran calculated by PM3 method was found to correlate linearly with the reaction rate logarithm. The mechanism of the solvent effect on the reaction rate consists in a specific complexation with the catalyst depending on the molecule rigidity and the creation of energetic and steric constraints for the substrate to access the catalyst.
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Original Russian Text © A.I. Ermakov, V.A. Averyanov, E.M. Kazakov, N.T. Sevost’yanova, 2011, published in Zhurnal Obshchei Khimii, 2011, Vol. 81, No. 4, pp. 570–575.
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Ermakov, A.I., Averyanov, V.A., Kazakov, E.M. et al. Mechanism of the solvent effect on the rate of the cyclohexene hydroxymethoxycarbonylation catalyzed by bis(triphenylphosphine)palladium. Russ J Gen Chem 81, 663–668 (2011). https://doi.org/10.1134/S1070363211040074
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DOI: https://doi.org/10.1134/S1070363211040074