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Related Concept Videos

Hess's Law03:40

Hess's Law

There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.
Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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: Jul 19, 2026

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

Published on: March 1, 2020

Nonadiabatic effects in the H+D2 reaction.

Rui-Feng Lu1, Tian-Shu Chu, Yan Zhang

  • 1State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

The Journal of Chemical Physics
|October 13, 2006
PubMed
Summary

This study investigated the H+D2 reaction dynamics using two computational methods. Results showed negligible non-adiabatic effects, indicating both approaches yield similar outcomes for this chemical reaction.

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Area of Science:

  • Chemical Dynamics
  • Quantum Chemistry
  • Reaction Kinetics

Background:

  • Understanding state-to-state dynamics is crucial for predicting reaction outcomes.
  • The H+D2 reaction serves as a fundamental benchmark system in chemical physics.
  • Investigating non-adiabatic effects provides deeper insights into reaction mechanisms.

Purpose of the Study:

  • To study the state-to-state dynamics of the H+D2 reaction.
  • To compare the accuracy of two computational approaches: single adiabatic sheet vs. coupled diabatic sheets.
  • To evaluate the significance of non-adiabatic effects on reaction probabilities and cross sections.

Main Methods:

  • Utilized the reactant-product decoupling method.
  • Employed a double many-body expansion potential energy surface.
  • Calculated rotational distributions, reaction probabilities, and integral cross sections at various collision energies.

Main Results:

  • No significant differences were observed in rotational distributions between the adiabatic and diabatic approaches.
  • Calculated total reaction probabilities and integral cross sections showed extremely small differences between the two methods.
  • Non-adiabatic effects were found to be negligible for collision energies below 2.0 eV.

Conclusions:

  • The choice between adiabatic and diabatic approaches has minimal impact on the studied dynamics of the H+D2 reaction at low energies.
  • Non-adiabatic effects are negligible in the H+D2 reaction for collision energies up to 2.0 eV.
  • The findings validate the use of simpler computational models for this specific reaction system within the studied energy range.