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Related Concept Videos

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
Reaction Mechanisms03:06

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

The rate-determining step, or RDS, in a chemical reaction is the slowest step that determines the overall reaction rate. It is identified by using the observed rate law and typically involves approximation methods like the RDS approximation or the steady-state approximation.In the RDS approximation, also known as the rate-limiting-step or equilibrium approximation, the reaction mechanism consists of one or more reversible reactions near equilibrium, followed by a slower RDS, and then one or...
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Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
Multi-Step Reactions02:31

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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Reaction Enumeration Based on NBO-Informed Molecular Graphs.

Javier E Alfonso-Ramos1, Thijs Stuyver1

  • 1Ecole Nationale Supérieure de Chimie de Paris, Université PSL, CNRS, i-CLeHS, Paris, France.

Journal of Computational Chemistry
|July 7, 2026
PubMed
Summary

This study introduces a new molecular graph method using valence orbitals and natural bond orbital analysis to accurately map chemical reactions. It overcomes limitations of traditional methods for complex molecules, enabling better chemical technology design.

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Area of Science:

  • Chemical reactions and molecular modeling
  • Computational chemistry and quantum mechanics

Background:

  • Traditional graph-based methods for enumerating chemical reactions face limitations with complex systems like transition-metal complexes and hypervalent compounds.
  • Ambiguity arises from relying solely on atomic connectivity and simple valency rules, hindering accurate pathway identification.

Purpose of the Study:

  • To develop a novel molecular graph representation that overcomes the limitations of traditional methods.
  • To enable systematic and computationally efficient identification of chemically meaningful reaction pathways for complex molecular systems.

Main Methods:

  • Introduced a molecular graph representation based on valence orbitals, not just atomic connectivity.
  • Integrated this representation with quantum-mechanical natural bond orbital (NBO) analysis.
  • The method adaptively adjusts reaction-step complexity based on detected delocalized bonding motifs.

Main Results:

  • The valence orbital-based graph representation successfully detects delocalized bonding.
  • The integrated approach systematically identifies reaction pathways beyond the scope of conventional methods.
  • Demonstrated robustness across diverse challenging chemical systems, including organometallic catalysis and hypervalent chemistry.

Conclusions:

  • The novel molecular graph approach offers a more accurate and comprehensive way to enumerate reaction pathways.
  • This method enhances the understanding of chemical reactivity and aids in designing new chemical technologies.
  • It provides a powerful tool for exploring complex chemical systems previously intractable to standard graph-based enumeration.