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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

31.4K
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:
31.4K
Multi-Step Reactions02:31

Multi-Step Reactions

8.9K
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...
8.9K
Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
11.1K
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

12.7K
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
12.7K
Catalysis02:50

Catalysis

30.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.9K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

18.0K
Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
18.0K

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A Web Tool for Generating High Quality Machine-readable Biological Pathways
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Preface: Special Topic on Reaction Pathways.

Cecilia Clementi1, Graeme Henkelman2

  • 1Department of Chemistry, Rice University, Houston, Texas 77005, USA.

The Journal of Chemical Physics
|October 23, 2017
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Summary
This summary is machine-generated.

This issue explores advanced methods for simplifying complex chemical systems using reaction pathways. It highlights versatile applications in biophysics and material science, showcasing shared methodologies and domain-specific needs.

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Area of Science:

  • Chemistry
  • Biophysics
  • Material Science

Background:

  • Focuses on developing and applying methods to describe complex chemical systems.
  • Utilizes simplified mechanisms and collective coordinates for analysis.

Discussion:

  • Presents a wide range of applications across different scientific domains.
  • Illustrates the state-of-the-art in reaction pathway analysis.

Key Insights:

  • Showcases similarities in the formulation of analytical approaches.
  • Highlights the diverse needs of different application domains.

Outlook:

  • Encourages interdisciplinary research by bridging biophysics and material science.
  • Aims to advance the understanding of complex chemical reactions through simplified models.