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

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

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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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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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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,...
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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

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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...
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Diverse N2 Functionalization Enabled by an Unsymmetric Dititanium Complex.

Yi-Fei Huang1, Yun-Shu Cui1, Si-Jun Xie1

  • 1Department of Chemistry, Fudan University, Shanghai 200438, China.

Journal of the American Chemical Society
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel dititanium dinitrogen complex capable of activating small molecules. The complex facilitates the synthesis of N-heterocycles directly from dinitrogen, offering new pathways in nitrogen chemistry.

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Area of Science:

  • Coordination chemistry
  • Organometallic chemistry
  • Catalysis

Background:

  • Di- and multinuclear metal complexes are crucial for small-molecule activation.
  • Nitrogen (N2) activation remains a significant challenge in chemistry.
  • Developing new ligands to support reactive metal centers is essential.

Purpose of the Study:

  • To synthesize and characterize a novel dititanium dinitrogen complex.
  • To investigate the reactivity of the dinitrogen moiety in the complex.
  • To explore the potential of this complex in synthesizing nitrogen-containing heterocycles.

Main Methods:

  • Synthesis of a symmetric phenoxide-bridged ligand.
  • Formation of an unsymmetric dititanium dinitrogen complex.
  • Characterization of the complex using spectroscopic and crystallographic methods.
  • Reactions of the complex with various electrophiles, including α,ω-dihaloalkanes.

Main Results:

  • A novel dititanium dinitrogen complex with side-on/end-on N2 coordination was successfully synthesized.
  • The complex features a highly nucleophilic (N2)4- unit.
  • Diverse derivatizations were achieved, forming N-C, N-Si, and N-P bonds.
  • Selective synthesis of structurally distinct N-heterocyclic compounds from reactions with α,ω-dihaloalkanes was demonstrated.

Conclusions:

  • The reported dititanium complex provides a new platform for N2 activation and functionalization.
  • The nucleophilic dinitrogen moiety enables the construction of various N-containing bonds.
  • This work highlights the potential for direct synthesis of N-heterocycles from N2.