Abstract
The interaction of 1,3-propanedithiolate with propargyl chloride leads to the formation of a mixture of products. After completion of the reaction (40–42 °C, 6.5 h), two main compounds were isolated: 2-methyl-6,7-dihydro-5H-1,4-dithiepin (62%) and 4,8-dithioundecadiin-2.9 (12%). Quantum chemical modeling of the mechanism of interaction between propargyl chloride and potassium 1,3-propanedithiolate in the hydrazine hydrate–KOH system was carried out using the combined approach CCSD(T)/6–31 + G*//B3LYP/6–311 + + G**. It was shown that the interaction of potassium propane dithiolate with propargyl chloride, leading to the formation of 2-methyl-6,7-dihydro-5H-1,4-dithiepine, proceeds sequentially via several stages. They include the nucleophilic substitution of the chlorine atom of propargyl chloride by one of the sulfide anions 1,3-propanedithiolate leading to the formation of a monosubstitution product. Under the influence of the medium, the latter undergoes an acetylene-allene rearrangement and turns into a more stable cumulated diene. The resulting diene derivative transforms into a dithiepine cycle due to the nucleophilic attack of the second sulfide anion of propane dithiolate on the sp-hybridized carbon atom. The formation of 4,8-dithioundecadiin-2,9 occurs when potassium propane dithiolate replaces chlorine atoms in two molecules of propargyl chloride, which is followed by the isomerization of the triple bond.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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The work was carried out using the material and technical base of the Baikal Analytical Center for Collective Use of the Siberian Branch of the Russian Academy of Sciences.
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All authors contributed to the study conception and design. Valentina Grabelnykh and Nikolay Korchevin conducted experimental studies of the reaction. Igor Ushakov established the structure of the obtained compounds. Elena Chirkina performed quantum-chemical calculations of the reaction under reseach. The first version of the manuscript was written by Elena Chirkina and Nikolay Korchevin, and the correction of the manuscript was carried out by Leonid Krivdin and Igor Rozentsveig. All authors read and approved the final manuscript.
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Chirkina, E.A., Grabelnykh, V.A., Korchevin, N.A. et al. Quantum-chemical study of organic reactions mechanisms. Struct Chem 34, 2263–2272 (2023). https://doi.org/10.1007/s11224-023-02199-9
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DOI: https://doi.org/10.1007/s11224-023-02199-9