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Related Concept Videos

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 Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
[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.
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...
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.
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

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Related Experiment Video

Updated: Jun 26, 2026

Behavioral Disturbances: An Innovative Approach to Monitor the Modulatory Effects of a Nutraceutical Diet
07:05

Behavioral Disturbances: An Innovative Approach to Monitor the Modulatory Effects of a Nutraceutical Diet

Published on: January 3, 2017

Diary keeping and well-being.

Elaine Duncan1, David Sheffield

  • 1Division of Psychology, School of Life Sciences, Glasgow Caledonian University, United Kingdom. edu@gcal.ac.uk

Psychological Reports
|December 24, 2008
PubMed
Summary
This summary is machine-generated.

This pilot study found that female students who kept diaries reported lower well-being. Further research is needed to explore this unexpected finding in student well-being and journaling.

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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Published on: August 20, 2018

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Last Updated: Jun 26, 2026

Behavioral Disturbances: An Innovative Approach to Monitor the Modulatory Effects of a Nutraceutical Diet
07:05

Behavioral Disturbances: An Innovative Approach to Monitor the Modulatory Effects of a Nutraceutical Diet

Published on: January 3, 2017

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
09:54

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Published on: August 20, 2018

Area of Science:

  • Psychology
  • Student Health
  • Mental Well-being

Background:

  • Self-reported well-being is a key indicator of mental health in student populations.
  • Journaling is often promoted as a tool for emotional regulation and well-being.

Purpose of the Study:

  • To investigate the relationship between diary-keeping and self-reported well-being in female university students.
  • To explore potential correlations between journaling habits and overall psychological health.

Main Methods:

  • A pilot study involving 177 female students.
  • Participants completed a diary-keeping survey and standardized measures of well-being.

Main Results:

  • Students who kept diaries reported significantly lower levels of well-being compared to non-diary keepers.
  • An inverse correlation was observed between journaling frequency and well-being scores.

Conclusions:

  • Contrary to popular belief, diary-keeping in this cohort was associated with diminished well-being.
  • Further research is warranted to understand the complex relationship between journaling and psychological health in students.