Abstract
The course of the Diels-Alder reactions of cyclopentadiene and maleic anhydride were studied. Two reaction paths were modelled: endo- and exo-selective paths. All structures within the transient region were characterized and analyzed by means of geometrical descriptors, physicochemical parameters and information-theoretical measures in order to observe the linkage between chemical behavior and the carriage of information. We have shown that the information-theoretical characterization of the chemical course of the reaction is in complete agreement with its phenomenological behavior in passing from reactants to products. In addition, we were able to detect the main differences between the two reaction mechanisms. This type of informational analysis serves to provide tools to help understand the chemical reactivity of the two simplest Diels-Alder reactions, which permits the establishment of a connection between the quantum changes that molecular systems exert along reaction coordinates and standard physicochemical phenomenology. In the present study, we have shown that every reaction stage has a family of subsequent structures that are characterized not solely by their phenomenological behavior but also by informational properties of their electronic density distribution (localizability, order, uniformity). Moreover, we were able to describe the main differences between endo-adduct and exo-adduct pathways. With the advent of new experimental techniques, it is in principle possible to observe the structural changes in the transient regions of chemical reactions. Indeed, through this work we have provided the theoretical concepts needed to unveil the concurrent processes associated with chemical reactions.
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Acknowledgments
We wish to thank José María Pérez-Jordá for kindly providing his numerical code. R.O.E. wishes to thank Juan Carlos Angulo and Jesús Sánchez-Dehesa for their kind hospitality during his 2012–2014 sabbatical stay at Universidad de Granada, Spain. R.O.E. thanks Consejo Nacional de Ciencia y Tecnología (CONACyT)-México for financial support. M.M.-E. wishes to thank CONACyT for a PhD fellowship. We acknowledge financial support through Mexican grants from CONACyT, Programa Integral de Fortalecimiento Institutcional (PIFI), Programa del Mejoramiento del Profesorado (PROMEP-SEP) and Spanish grants FIS2011-24540, FQM-7276 and FQM-4643. J.C.A. and R.O.E. belong to the Andalusian research group FQM-020 and J.S.D. to FQM-0207. Allocation of supercomputing time from Laboratorio de Supercómputo y Visualización (U.A.M.), Sección de Supercomputación at CSIRC (U. de G.) and from Proteus (Instituto “Carlos I”) is gratefully acknowledged.
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Molina-Espíritu, M., Esquivel, R.O., Kohout, M. et al. Insight into the informational-structure behavior of the Diels-Alder reaction of cyclopentadiene and maleic anhydride. J Mol Model 20, 2361 (2014). https://doi.org/10.1007/s00894-014-2361-y
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DOI: https://doi.org/10.1007/s00894-014-2361-y