Quantum Chemical Prediction of Reaction Pathways and Rate Constants for the Reactions of Ox (x = 1 and 2) with Pristine and Defective Graphite (0001) Surfaces

2012 ◽  
Vol 116 (2) ◽  
pp. 1841-1849 ◽  
Author(s):  
S. C. Xu ◽  
Hui-Lung Chen ◽  
M. C. Lin
Keyword(s):  
Rate Constants ◽  
Quantum Chemical ◽  
Reaction Pathways

Predicting Feasible Organic Reaction Pathways Using Heuristically Aided Quantum Chemistry

2018 ◽  
Author(s):  
Dmitrij Rappoport ◽  
Alan Aspuru-Guzik
Keyword(s):  
Quantum Chemistry ◽  
Reaction Mechanisms ◽  
Quantum Chemical ◽  
Organic Reactions ◽  
Reaction Pathways ◽  
Empirical Knowledge ◽  
Organic Reaction ◽  
Chemical Methods ◽  
Quantum Chemical Methods ◽  
Wide Range

Studying organic reaction mechanisms using quantum chemical methods requires from the researcher an extensive knowledge of both organic chemistry and first-principles computation. The need for empirical knowledge arises because any reasonably complete exploration of the potential energy surfaces (PES) of organic reactions is computationally prohibitive. We have previously introduced the Heuristically-Aided Quantum Chemistry (HAQC) approach to modeling complex chemical reactions, which abstracts the empirical knowledge in terms of chemical heuristics—simple rules guiding the PES exploration—and combines them with structure optimizations using quantum chemical methods. The HAQC approach makes use of heuristic kinetic criteria for selecting reaction paths that are not only plausible, that is, consistent with the empirical rules of organic reactivity, but also feasible under the reaction conditions. In this work, we develop heuristic kinetic feasilibity criteria, which correctly predict feasible reaction pathways for a wide range of simple polar (substitutions, additions, and eliminations) and pericyclic organic reactions (cyclizations, sigmatropic shifts, and cycloadditions). In contrast to knowledge-based reaction mechanism prediction methods, the same kinetic heuristics are successful in classifying reaction pathways as feasible or infeasible across this diverse set of reaction mechanisms. We discuss the energy profiles of HAQC and their potential applications in machine learning of chemical reactivity.<br>

Predicting Feasible Organic Reaction Pathways Using Heuristically Aided Quantum Chemistry

2018 ◽  
Author(s):  
Dmitrij Rappoport ◽  
Alan Aspuru-Guzik
Keyword(s):  
Quantum Chemistry ◽  
Reaction Mechanisms ◽  
Quantum Chemical ◽  
Organic Reactions ◽  
Reaction Pathways ◽  
Empirical Knowledge ◽  
Organic Reaction ◽  
Chemical Methods ◽  
Quantum Chemical Methods ◽  
Wide Range

Studying organic reaction mechanisms using quantum chemical methods requires from the researcher an extensive knowledge of both organic chemistry and first-principles computation. The need for empirical knowledge arises because any reasonably complete exploration of the potential energy surfaces (PES) of organic reactions is computationally prohibitive. We have previously introduced the Heuristically-Aided Quantum Chemistry (HAQC) approach to modeling complex chemical reactions, which abstracts the empirical knowledge in terms of chemical heuristics—simple rules guiding the PES exploration—and combines them with structure optimizations using quantum chemical methods. The HAQC approach makes use of heuristic kinetic criteria for selecting reaction paths that are not only plausible, that is, consistent with the empirical rules of organic reactivity, but also feasible under the reaction conditions. In this work, we develop heuristic kinetic feasilibity criteria, which correctly predict feasible reaction pathways for a wide range of simple polar (substitutions, additions, and eliminations) and pericyclic organic reactions (cyclizations, sigmatropic shifts, and cycloadditions). In contrast to knowledge-based reaction mechanism prediction methods, the same kinetic heuristics are successful in classifying reaction pathways as feasible or infeasible across this diverse set of reaction mechanisms. We discuss the energy profiles of HAQC and their potential applications in machine learning of chemical reactivity.<br>

Reaction of H2with O2in Excited Electronic States: Reaction Pathways and Rate Constants

2017 ◽  
Vol 121 (50) ◽  
pp. 9599-9611 ◽  
Author(s):  
Alexey V. Pelevkin ◽  
Boris I. Loukhovitski ◽  
Alexander S. Sharipov
Keyword(s):  
Rate Constants ◽  
Electronic States ◽  
Reaction Pathways ◽  
Excited Electronic States
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