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Related Concept Videos

[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 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.
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
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 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...
Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...

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Related Experiment Video

Updated: Jun 1, 2026

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
10:16

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

4,4'-(Propane-1,3-diyldi-oxy)dibenz-aldehyde.

Qamar Ali, Muhammad Raza Shah, Seik Weng Ng

    Acta Crystallographica. Section E, Structure Reports Online
    |May 19, 2011
    PubMed
    Summary

    This study details a V-shaped dialdehyde molecule (C17H16O4) with two formyl-phenoxy units. The compound forms dimers in crystal structures through hydrogen bonds.

    Area of Science:

    • Organic Chemistry
    • Crystallography
    • Molecular Structure

    Background:

    • Dialdehydes are versatile organic compounds with diverse applications.
    • Understanding molecular geometry and intermolecular interactions is crucial in materials science.

    Purpose of the Study:

    • To characterize the molecular structure and crystal packing of a novel dialdehyde compound.
    • To investigate the hydrogen bonding interactions in the solid state.

    Main Methods:

    • Single-crystal X-ray diffraction was used to determine the molecular and crystal structure.
    • Analysis of intermolecular interactions, including hydrogen bonds.

    Main Results:

    • The title compound, C17H16O4, exhibits a V-shaped molecular geometry with a central methylene chain.

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  • The benzene rings are positioned at an angle of 77.4(1)°.
  • Centrosymmetric dimers are formed via non-classical C-H⋯O hydrogen bonds in the crystal.

    • Conclusions:

    • The study provides a detailed structural analysis of the novel dialdehyde.
    • The identified hydrogen bonding pattern influences the crystal packing and material properties.