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

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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.
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Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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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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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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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...
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Iron-catalyzed coupling of three reactants.

Guillaume Lefèvre1

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Summary
This summary is machine-generated.

Vinyl boronates enable efficient carbon-carbon bond formation. This coupling reaction proceeds under mild conditions, making it a versatile tool for organic synthesis.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Carbon-carbon bond formation is fundamental in organic synthesis.
  • Vinyl boronates are versatile building blocks.

Purpose of the Study:

  • To develop a mild and efficient coupling method using vinyl boronates.
  • To enable the formation of carbon-carbon bonds with two coupling partners.

Main Methods:

  • Utilized vinyl boronates as coupling reagents.
  • Employed mild reaction conditions.
  • Facilitated double coupling through carbon-carbon bonds.

Main Results:

  • Achieved successful coupling of vinyl boronates.
  • Demonstrated the formation of carbon-carbon bonds under mild conditions.
  • Showcased the ability to couple with two partners.

Conclusions:

  • Vinyl boronates are effective reagents for mild C-C bond formation.
  • The developed method offers a versatile approach for synthesizing complex molecules.