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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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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

10.8K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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2.6K
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...
2.6K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

5.0K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Cyclodiphosphazanes: options are endless.

Maravanji S Balakrishna1

  • 1Phosphorus Laboratory, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India. krishna@chem.iitb.ac.in msb_krishna@iitb.ac.in.

Dalton Transactions (Cambridge, England : 2003)
|July 19, 2016
PubMed
Summary
This summary is machine-generated.

Cyclodiphosphazanes, versatile phosphorus-nitrogen rings, act as ligands in coordination chemistry and scaffolds in supramolecular chemistry. Their applications extend to novel 3D-coordination polymers and N-heterocyclic carbenes.

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Area of Science:

  • Inorganic Chemistry
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Cyclodiphosphazanes (diazadiphosphetidines) are saturated inorganic ring systems with alternating P(III) and N atoms.
  • They possess a rigid planar structure and moderately stable P-N bonds, enabling diverse chemical applications.

Purpose of the Study:

  • To review the coordination chemistry of cyclodiphosphazanes as neutral ligands.
  • To highlight their applications and recent advances in cyclodiphosph(iii)azane chemistry.
  • To present an empirical model for their coordinating ability in forming soft-soft MOFs.

Main Methods:

  • Literature review focusing on coordination chemistry and supramolecular applications.
  • Analysis of structural features and coordinating abilities.
  • Discussion of recent advancements in cyclodiphosphazane chemistry.

Main Results:

  • Cyclodiphosphazanes exhibit versatility as neutral and anionic ligands in coordination chemistry.
  • They serve as scaffolds in supramolecular chemistry, leading to novel molecular architectures.
  • Recent utility in generating 3D-coordination polymers, sodalite structures, N-heterocyclic carbenes, and biradicaloids is demonstrated.

Conclusions:

  • Cyclodiphosphazanes are valuable building blocks in inorganic and supramolecular chemistry.
  • Their coordination chemistry and applications in materials science, particularly MOFs, are significant.
  • Further exploration of cyclodiphosph(iii)azane chemistry promises novel discoveries.