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Related Concept Videos

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.
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 position.
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.
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[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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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...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

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Copper-mediated intermolecular direct biaryl coupling.

Masanori Kitahara1, Nobuyoshi Umeda, Koji Hirano

  • 1Department of Applied Chemistry, Faculty of Engineering, Osaka University , Suita, Osaka 565-0871, Japan.

Journal of the American Chemical Society
|January 28, 2011
PubMed
Summary

Copper salts enable direct biaryl coupling of arylazines and azoles through dual C-H bond cleavage, bypassing palladium. This novel copper-catalyzed method efficiently synthesizes biaryl structures for pharmaceuticals and materials.

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Published on: September 18, 2016

Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Biaryl motifs are crucial structural units in pharmaceuticals and functional materials.
  • Palladium-catalyzed cross-coupling reactions are common for biaryl synthesis.
  • Developing metal-catalyzed C-H activation/arylation methods is an active area of research.

Purpose of the Study:

  • To develop a palladium-free method for direct biaryl coupling.
  • To explore the utility of copper salts in C-H arylation reactions.
  • To provide a new synthetic route to biaryl compounds from arylazines and azoles.

Main Methods:

  • Copper-mediated intermolecular direct biaryl coupling reaction.
  • Utilizing arylazines and azoles as coupling partners.
  • Employing dual C-H bond cleavage strategy.

Main Results:

  • Successful copper-mediated direct biaryl coupling of arylazines and azoles.
  • The reaction proceeds efficiently without the need for palladium catalysts.
  • Demonstrated the potential of copper salts in direct C-H arylation.

Conclusions:

  • Copper salts are highly effective catalysts for direct C-H arylation.
  • A novel and efficient approach to synthesizing biaryl motifs has been established.
  • This method offers a valuable alternative for constructing biaryl compounds relevant to medicinal chemistry and materials science.