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Related Concept Videos

E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

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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...
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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,...
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SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
12.2K
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...
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Reaction Mechanisms03:06

Reaction Mechanisms

31.3K
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:
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Related Experiment Video

Updated: Feb 19, 2026

Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
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Direct and Delayed Dynamics in Electron-Induced Surface Reaction.

Oliver MacLean1, Kai Huang1, Lydie Leung1

  • 1Lash Miller Chemical Laboratories, Department of Chemistry and Institute of Optical Sciences, University of Toronto , 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

Journal of the American Chemical Society
|November 9, 2017
PubMed
Summary
This summary is machine-generated.

Electron-induced reactions of vinyl bromide and allyl bromide on copper surfaces were investigated. A significant "Delayed" reaction pathway was discovered, occurring after molecule diffusion, alongside a "Direct" pathway.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Understanding electron-induced reactions is crucial for surface chemistry.
  • Vinyl bromide and allyl bromide are key molecules in organic synthesis and materials science.

Purpose of the Study:

  • To investigate the electron-induced reaction pathways of vinyl bromide and allyl bromide on a Cu(110) surface.
  • To elucidate the dynamics and mechanisms of these surface reactions.

Main Methods:

  • Experimental study using scanning tunneling microscopy (STM) at 4.6 K.
  • Theoretical investigation using molecular dynamics (MD) simulations.

Main Results:

  • Two reaction pathways were identified: "Direct" (under the tip) and "Delayed" (spontaneous after diffusion).
  • The "Delayed" pathway was a major route, accounting for 68% of vinyl bromide and 53% of allyl bromide reactions.
  • Evidence for a long-lived vibrationally excited intermediate was observed for both pathways.
  • MD simulations confirmed that specific vibrational modes dictate either Direct or Delayed reaction outcomes.

Conclusions:

  • The study reveals a novel "Delayed" reaction pathway for electron-induced reactions of vinyl and allyl bromide on Cu(110).
  • Vibrational excitation plays a critical role in determining the reaction dynamics and outcomes.