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Related Concept Videos

Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends on...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...

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Related Experiment Video

Updated: Jun 13, 2026

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

Selective dissociation in dication-molecule reactions.

Michael A Parkes1, Jessica F Lockyear, Stephen D Price

  • 1University College London, Department of Chemistry, 20 Gordon Street, London, WC1H 0AJ, UK.

Physical Chemistry Chemical Physics : PCCP
|April 17, 2010
PubMed
Summary
This summary is machine-generated.

Single electron transfer reactions reveal differing dissociation pathways for carbon dioxide and oxygen dications. Capture monocations show greater dissociation propensity, influenced by electronic state population during electron transfer.

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Spatial Separation of Molecular Conformers and Clusters
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Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
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Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry

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Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
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10:37

Spatial Separation of Molecular Conformers and Clusters

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Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
07:53

Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry

Published on: March 1, 2020

Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Quantum Chemistry

Background:

  • Investigating electron transfer reactions in molecular dications is crucial for understanding ion-molecule interactions.
  • Previous studies indicated preferential dissociation of capture monocations in carbon dioxide systems.

Purpose of the Study:

  • To elucidate the preferential dissociation mechanisms of molecular ions formed via single electron transfer.
  • To test theoretical explanations for the observed dissociation differences in carbon dioxide and oxygen systems.

Main Methods:

  • Utilized a position-sensitive coincidence technique to study single electron transfer reactions.
  • Analyzed dissociation pathways of capture and ejection monocations for (13)CO(2)(2+)/(12)CO(2) and (18)O(2)(2+)/(16)O(2) collision systems.

Main Results:

  • Carbon dioxide capture monocations ((13)CO(2)(+)) exhibit higher dissociation propensity than ejection monocations ((12)CO(2)(+)).
  • Oxygen ejection monocations ((16)O(2)(+)) show preferential dissociation, contrasting with carbon dioxide.
  • Dissociation pathways are linked to the population of specific electronic states (e.g., C(2)Sigma, quartet states for CO(2); B(2)Sigma, b(4)Sigma for O(2)).

Conclusions:

  • Preferential dissociation is governed by the electronic states populated during electron transfer, favoring one-electron transitions.
  • The observed differences in CO(2) and O(2) dissociation align with principles of electron transfer reactivity.
  • Findings support theoretical models explaining ion-molecule reaction dynamics and dissociation behavior.