Abstract
Car–Parrinello molecular dynamics and metadynamics were carried out for salt-free Wittig reaction of non-stabilized, semi-stabilized and stabilized ylides and correlated to static quantum calculation at PBE/6-31G(d, p), including continuum solvation. The Grimme’s dispersion correction approach (DFT-D) was employed throughout the study for both methods. The aim of the present investigations is to reformulate in details than has been possible hitherto, the reaction path and introduce all the stable and metastable states in the Wittig reaction, using ab-initio molecular dynamics tools. In what follows, we show that in the calculated free energy surface, betaine appears at the beginning of the reaction followed by oxaphosphetane for all ylides. The betaine has a higher energy and short life time than oxaphosphetane. It is found that increasing the ylide stability extends the reaction onset time and reduces the overall reaction time. The metadynamics trajectory (metatrajectory) shows the early formation of the C–C bond followed by the P–O bonding formation and simultaneous breaking of the P–C and C–O bond. Within this process, a high E selectivity for all ylides is observed. The metadynamics analysis encompasses all possible energy reaction coordinates; this property provides a more detailed mechanistic picture. Comparison with static calculations demonstrates the potential of the metadynamics approach in the conformational and geometric analysis of the cycloaddition and the cycloelimination processes.
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Acknowledgements
The authors are deeply grateful to the University of Oran (Algeria) for computing resources, storage and computer time used on Haytham at the UCI (Unité de Calcul Intensif), and to the University of Reims Champagne Ardennes (URCA, France) for computing resources and computer time used on Romeo calculator and Al-Farabi Cluster of the Ecole Nationale Polytechnique Oran-Maurice Audin.
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AA: Calculation , Text-Presentation, Analysis, Graph & Tables, Discussion HS: Calculation, Graph & Tables SM: Calculation, Graph & Tables RHA: Calculation, Analysis AMK: Text-Presentation, Analysis, Graph & Tables, Discussion All authors reviewed the manuscript before submission.
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Adda, A., Aoul, R.H., Sediki, H. et al. Selectivity in the Wittig reaction within the ab initio static and metadynamics approaches. Theor Chem Acc 142, 102 (2023). https://doi.org/10.1007/s00214-023-03029-1
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DOI: https://doi.org/10.1007/s00214-023-03029-1