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SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

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...
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

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 in the...

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Related Experiment Video

Updated: Jun 19, 2026

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

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Reaction Discovery in Porous Materials Using Periodic Nanoreactor Molecular Dynamics.

Daniel Deißenbeck1, Patrick Meier1, Wassja A Kopp1

  • 1Institute for Physical Chemistry, Heinrich Heine University Düsseldorf, Universitätsstraße 1, 40225, Düsseldorf, Germany.

Angewandte Chemie (International Ed. in English)
|December 15, 2025
PubMed
Summary

This study introduces a nanoreactor molecular dynamics (NMD) approach to map catalytic reactions in zeolites. The method discovered new pathways for nitrogen oxide reduction, improving understanding of selective catalytic reduction (SCR) processes.

Keywords:
Ab initio calculationsMolecular dynamicsPeriodic boundary conditionsSelective catalytic reduction

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Last Updated: Jun 19, 2026

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Chemical Engineering
  • Heterogeneous Catalysis

Background:

  • Catalytic processes are crucial for energy-efficient molecular transformations.
  • Porous materials like zeolites are vital in heterogeneous catalysis due to their unique structures and high surface areas.
  • Understanding reaction networks in zeolites is key to optimizing catalytic applications.

Purpose of the Study:

  • To investigate the reaction network of selective catalytic reduction (SCR) of NO over copper-exchanged chabazite zeolites.
  • To develop and apply a periodic ab initio nanoreactor molecular dynamics (NMD) approach for autonomous reaction discovery.
  • To elucidate the formation mechanisms of both desired and undesired products in SCR reactions.

Main Methods:

  • Periodic ab initio nanoreactor molecular dynamics (NMD) simulations.
  • Autonomous discovery of reaction pathways using automated reaction detection.
  • Refinement of reaction paths with free energy corrections via phonon spectrum computation.

Main Results:

  • Autonomous discovery of established and novel reaction pathways for SCR of NO.
  • Identification of a water-assisted tautomerization mechanism for N2 formation.
  • Discovery of a new radical-driven pathway leading to N2O formation.
  • Observation of reactivity involving Brønsted acid sites within the zeolite framework.
  • Construction of a comprehensive reaction network detailing product formation.

Conclusions:

  • The NMD approach effectively elucidates complex reaction networks in heterogeneous catalysis.
  • New mechanistic insights into SCR side-reactions, including N2 and N2O formation, were gained.
  • The study demonstrates the versatility of NMD for agnostic reaction discovery in advanced catalytic systems.