Formation and evolution of C–C, C–O, CO and C–N bonds in chemical reactions of prebiotic interest

The critical and vanishing points of the reaction force F(ξi)=-dV(ξi)/dξi yield five important coordinates (ξR, ξR*, ξTS, ξP*, ξP) along the intrinsic reaction coordinate (IRC) for a given concerted reaction or reaction step. These points partition the IRC into three well defined regions: reactants (ξR →ξR*), transition state (ξR* →ξP*), and products (ξP* →ξP) with traditional roles of mostly structural changes associated to the reactants and products regions and mostly electronic activity associated to the TS region. Following the evolution of chemical bonding along the IRC using formal descriptors of synchronicity, Reaction Electron Flux, Wiberg Bond Orders (WBO) and their derivatives (or, more precisely, the intensity of the electron activity) unambiguously indicates that for non--synchronous reactions, electron activity transcends the TS region and takes place well into the reactants and products regions. Under these circumstances, an extension of the TS region toward the reactants and products regions may occur.

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The transition state region in nonsynchronous concerted reactions

Gómez

Rojas‐Valencia

Toro-Labbé

et al. 2023

The Journal of Chemical Physics

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Formation and evolution of C–C, C–O, CO and C–N bonds in chemical reactions of prebiotic interest

Abstract: A series of prebiotic chemical reactions yielding the precursor building blocks of amino acids, proteins and carbohydrates, starting solely from HCN and water is studied here.

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The transition state region in nonsynchronous concerted reactions

The transition state region in nonsynchronous concerted reactions

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