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Structure of Conjugated Dienes

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...

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

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

[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.

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Related Experiment Video

Updated: Jun 1, 2026

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

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Published on: November 15, 2017

1,2-Bis(3-hydroxy-benzyl-idene)diazane.

Ling Zhu, Xin-Hua Zhao

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

Researchers unexpectedly synthesized a novel compound, C(14)H(12)N(2)O(2), from isonicotinic hydrazide and 3-hydroxy-benzaldehyde. The crystal structure reveals molecules forming infinite layers via hydrogen bonds.

Area of Science:

Organic Chemistry
Crystallography
Supramolecular Chemistry

Background:

Isonicotinic hydrazide and 3-hydroxy-benzaldehyde are common organic precursors.
Unexpected synthetic outcomes can lead to novel chemical entities.
Hydrogen bonding plays a crucial role in molecular self-assembly.

Purpose of the Study:

To characterize the crystal structure of a compound unexpectedly synthesized from isonicotinic hydrazide and 3-hydroxy-benzaldehyde.
To elucidate the intermolecular interactions governing the crystal packing.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
The synthesis involved refluxing an ethanolic solution of the starting materials.

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Main Results:

The asymmetric unit contains a half-molecule with the N-N bond centered on an inversion center.
The crystal structure exhibits an infinite layer structure facilitated by intermolecular O-H⋯N hydrogen bonds.
The compound's chemical formula is C(14)H(12)N(2)O(2).

Conclusions:

The unexpected reaction yielded a new compound with a defined crystal structure.
Intermolecular hydrogen bonding dictates the formation of a layered supramolecular architecture.
This study highlights the potential for novel compound discovery through seemingly simple synthetic routes.