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Quantum chemical investigation of the oxidative addition reaction of allyl carboxylates to Ni(0) and Pd(0) complexes

https://doi.org/10.32362/2410-6593-2019-14-6-56-65

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Abstract

Objectives. The first allylpalladium complex was synthesized and characterized 60 years ago at the Department of Physical Chemistry of M.V. Lomonosov Moscow State University of Fine Chemical Technology (MITHT). This discovery was an important stage in the development of a new direction in chemistry - metal complex catalysis, which subsequently led to understanding the strategy for studying the mechanisms of catalysts action, and gave a powerful impetus to the study of intermediates of catalytic reactions. The key sta.ge in many catalytic processes involving transition metal complexes is the oxidative addition stage. The study’s aim was the quantum chemical modeling of the oxidative addition stage of allylic carboxylates to the Ni(0) and Pd(0) complexes.

Methods. Quantum chemical calculations were carried out under the Kohn-Sham method for the density Junctional theory using the PBE exchange-correlation Junctional and all-electron L11 basis set.

Results. As a result of theoretical study, we showed that the oxidative addition of allyl acetate to the triisopropylphosphite complex of nickel(0) and allyl formate to the triphenylphosphine complex of palladium(O) can proceed along two routes. In the first of them, in the coordinated breaking of the С-О bond and the formation of the metal-O bond, the same oxygen atom is involved, thus forming a three-center transition state. In the second route, the restructuring of relations is carried out in a five-center transition state. The chelating effect in the five-centered transition state of the second route reduces the reaction’s activation barrier by 12.7 kcal/mol for allyl acetate and the nickel(0) triisopropylphosphite complex Ni(P(QPr)3)2 and by 9.9 kcal/mol for allyl formate and the palladium(O) triphenylphosphine complex Pd(PPh3). The presence of the second triphenylphosphine ligand in Pd(PPh3)2 reduces the activation barrier by only 2.6 kcal/mol.

Conclusions. The quantum chemical modeling performed allowed us to determine the preference for the oxidative addition of allyl carboxylates to the Ni(0) and Pd(0) complexes through a five-center transition state. The reaction’s activation barriers through the “classical” three-center interaction are 9.9-12.7 kcal/mol higher, and the chelating effect is more noticeable for the Ni complex The presence in the coordination sphere of several bulky ligands, such as triphenylphosphine, practically eliminates the chelating effect in the oxidative addition of allyl carboxylates.

About the Authors

K. Т. Egiazaryan
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Karen T. Egiazaryan - Master Student, Ya.K. Syrkin Department of Physical Chemistry.

86, Vernadskogo pr., Moscow 119571



R. S. Shamsiev
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Ravshan S. Shamsiev - Dr. of Sci. (Chemistry), Professor of the Ya.K. Syrkin Department of Physical Chemistry, Scopus Author ID 6506076152.

86, Vernadskogo pr., Moscow 119571



V. R. Flid
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Vitaly R. Flid - Dr. of Sci. (Chemistry), Professor, Head of the Ya.K. Syrkin Department of Physical Chemistry, Scopus Author ID 6602997346.

86, Vernadskogo pr., Moscow 119571



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Supplementary files

1. Fig. 3. Optimized structures of reagents (R), transition states (TS), and products (P) of the oxidation addition stage of C3H5OCOH to the Pd(PPh3). Interatomic distances are given in Å
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Egiazaryan K.Т., Shamsiev R.S., Flid V.R. Quantum chemical investigation of the oxidative addition reaction of allyl carboxylates to Ni(0) and Pd(0) complexes. Fine Chemical Technologies. 2019;14(6):56-65. https://doi.org/10.32362/2410-6593-2019-14-6-56-65

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