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Review
. 2021 Apr;5(4):240-255.
doi: 10.1038/s41570-021-00260-x. Epub 2021 Mar 16.

Organic reactivity from mechanism to machine learning

Kjell Jorner  1 , Anna Tomberg  2 , Christoph Bauer  3 , Christian Sköld  4 , Per-Ola Norrby  5
Affiliations
Review

Organic reactivity from mechanism to machine learning

Kjell Jorner et al. Nat Rev Chem. 2021 Apr.

Erratum in

Abstract

As more data are introduced in the building of models of chemical reactivity, the mechanistic component can be reduced until 'big data' applications are reached. These methods no longer depend on underlying mechanistic hypotheses, potentially learning them implicitly through extensive data training. Reactivity models often focus on reaction barriers, but can also be trained to directly predict lab-relevant properties, such as yields or conditions. Calculations with a quantum-mechanical component are still preferred for quantitative predictions of reactivity. Although big data applications tend to be more qualitative, they have the advantage to be broadly applied to different kinds of reactions. There is a continuum of methods in between these extremes, such as methods that use quantum-derived data or descriptors in machine learning models. Here, we present an overview of the recent machine learning applications in the field of chemical reactivity from a mechanistic perspective. Starting with a summary of how reactivity questions are addressed by quantum-mechanical methods, we discuss methods that augment or replace quantum-based modelling with faster alternatives relying on machine learning.

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