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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.
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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.
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.
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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, the...

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Divalent dirhodium imido complexes: formation, structure, and alkyne cycloaddition reactivity.

Shin Takemoto1, Shohei Otsuki, Yasuhiro Hashimoto

  • 1Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan. takemoto@c.s.osakafu-u.ac.jp

Journal of the American Chemical Society
|June 19, 2008
PubMed
Summary

New dirhodium amido complexes were synthesized and used to create dirhodium imido species. These imido species undergo cycloaddition reactions with alkynes, forming novel azametallacycles, and can be isolated using sterically hindered reagents.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • Dirhodium complexes are versatile precursors in organometallic synthesis.
  • Imido ligands play a crucial role in catalytic cycles and material science.

Purpose of the Study:

  • To synthesize novel dirhodium amido complexes.
  • To explore the reactivity of dirhodium imido species.
  • To characterize new organometallic compounds and their structures.

Main Methods:

  • Chloride displacement reactions for complex synthesis.
  • Trapping reactions with phosphines and alkynes.
  • Metathesis reactions with sterically hindered reagents.
  • X-ray crystallography for structural determination.

Main Results:

  • Synthesis of dirhodium amido complexes [(Cp*Rh)2(mu2-NHPh)(mu2-X)].
  • Formation of dirhodium imido species [Cp*Rh(mu2-NPh)RhCp*].
  • Cycloaddition reactions yielding azametallacycles [Cp*Rh(mu2-eta2:eta3-R1CCR2NPh)RhCp*].
  • Isolation of unsaturated imido complex [Cp*Rh(mu2-NAr)RhCp*] using sterically hindered reagents.
  • Structural characterization of key intermediates and products via X-ray diffraction.

Conclusions:

  • Dirhodium amido complexes are effective precursors to reactive dirhodium imido species.
  • The imido species exhibit diverse reactivity, including cycloaddition with alkynes.
  • Steric hindrance is key for isolating unsaturated imido complexes.
  • The reported structures provide insights into bonding and reactivity in dirhodium systems.