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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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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.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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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.
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Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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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...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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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.
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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

16.9K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
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Updated: Apr 18, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Stable heterocyclopentane-1,3-diyls.

Alexander Hinz1, Axel Schulz, Alexander Villinger

  • 1Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany) http://www.schulz.chemie.uni-rostock.de/

Angewandte Chemie (International Ed. in English)
|January 22, 2015
PubMed
Summary

Researchers activated carbon monoxide (CO) using a diphosphadiazanediyl compound at room temperature. This led to a novel ring expansion, forming a stable cyclopentane-1,3-diyl analogue with photochromic properties.

Keywords:
activationbiradicaloidscarbon monoxidephosphorusradicals

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Area of Science:

  • Organometallic Chemistry
  • Small Molecule Activation
  • Photochemistry

Background:

  • Diphosphadiazanediyl compounds are known for activating small molecules.
  • Carbon monoxide (CO) activation can lead to diverse products depending on the binding mode.

Purpose of the Study:

  • To investigate the activation of carbon monoxide (CO) by a specific diphosphadiazanediyl compound.
  • To explore the reaction products and their properties.

Main Methods:

  • Reaction of diphosphadiazanediyl with CO at ambient conditions (1 bar, 25°C).
  • Characterization of the resulting product.

Main Results:

  • CO activation occurred readily at ambient temperature.
  • An unprecedented ring expansion reaction of CO was observed.
  • Formation of the first stable cyclopentane-1,3-diyl analogue was achieved.
  • The product exhibited photochromic molecular switch characteristics.

Conclusions:

  • Diphosphadiazanediyl efficiently activates CO, leading to novel reactivity.
  • The resulting cyclopentane-1,3-diyl analogue is a stable, photochromic molecular switch.