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On the electron flow sequence driving the hydrometallation of acetylene by lithium hydride

  • Eduardo Chamorro
  • Mario Duque-Noreña
  • Savaş Kaya
  • Elizabeth Rincón
  • Patricia Pérez
Original Paper
  • 70 Downloads
Part of the following topical collections:
  1. International Conference on Systems and Processes in Physics, Chemistry and Biology (ICSPPCB-2018) in honor of Professor Pratim K. Chattaraj on his sixtieth birthday

Abstract

The sequence of the electronic flow driving the hydrometallation of acetylene by lithium hydride (and that of the opposite β-hydride elimination reaction from the alkenyl metal intermediate), was examined within the perspective provided by the bonding evolution theory (BET). The analysis was based on the application of catastrophe theory to the changes of the electron localization function topology along the intrinsic reaction coordinate. The description of the electronic processes occurring on the process was represented in terms of topological structural stability domains (SSDs) and the associated elementary bifurcation catastrophes. Within such a framework of representation, the “evolution” of the system through the different SSDs reveals the key chemical events driving the transformation, including the large polarization effect as a consequence of Pauli repulsion between ions of the positive cationic metal on the hydride domain, the activation of the CC triple bond to attack the cationic center, and the agostic stabilizing interactions involving the hardest cationic metal, followed by the attack of the hydride center. These results contribute to emphasizing the intrinsic value and usefulness of using topological-based approaches and associated tools to increase our knowledge and understanding of the subtleties underlying the electronic flow as nuclei evolve along the reaction coordinate, providing detailed and complementary insights in comparison to other interpretative tool such those based on orbital-based representations, concerning the intimate nature of the electronic rearrangement of key mechanistic processes in chemistry.

Graphical abstract

The sequence of the electron flow (indicated by letters a and b) along the intrinsic reaction path for the hydrometallation of acetylene by lithium hydride to yield ethenyl lithium via a four-membered transition structure (TS), as determined within the bonding evolution theory to provide the key chemical events driven the changes in the key bonding patterns. Blue arrow Main event on the side HC ≡ CH + LiH → TS, red arrow the TS → HLiC=CH2 pathway, green arrows relative motion of nuclei along the imaginary frequency at the position of TS on the intrinsic reaction coordinate.

Keywords

Bonding evolution theory (BET) Electron localization function (ELF) Catastrophe theory Hydrometallation β-hydride elimination Ethenyl Lithium LiH 

Notes

Acknowledgments

We acknowledge the continuous support provided by Fondo Nacional de Ciencia y Tecnología (FONDECYT - Chile) through Projects 1181582 (EC) and 1180348 (PP).

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Authors and Affiliations

  1. 1.Facultad de Ciencias Exactas, Departamento de Ciencias QuímicasUniversidad Andres BelloSantiagoChile
  2. 2.Faculty of Science, Department of ChemistryCumhuriyet UniversitySivasTurkey
  3. 3.Facultad de Ciencias, Instituto de Ciencias QuímicasUniversidad Austral de ChileValdiviaChile

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