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

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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.
8.0K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.4K
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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Palladium-catalyzed dearomative trimethylenemethane cycloaddition reactions.

Barry M Trost1, Veronika Ehmke, B Michael O'Keefe

  • 1Department of Chemistry, Stanford University , Stanford, California 94305, United States.

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|May 31, 2014
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This study introduces a new palladium-catalyzed reaction for dearomatizing nitroarenes into alicyclic compounds. The method is versatile and includes an enantioselective variant for asymmetric synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Nitroarenes are common synthetic building blocks.
  • Dearomatization reactions offer novel pathways to complex cyclic structures.
  • Asymmetric dearomatization is a challenging but valuable transformation.

Purpose of the Study:

  • To develop a general protocol for palladium-catalyzed dearomative trimethylenemethane [3+2] cycloaddition with nitroarenes.
  • To achieve exclusive formation of dearomatized alicyclic products.
  • To establish an enantioselective variant of this dearomatization process.

Main Methods:

  • Palladium-catalyzed [3+2] cycloaddition reaction.
  • Utilizing nitroarene substrates.
  • Employing chiral bisdiamidophosphite ligands for enantioselectivity.

Main Results:

  • A general protocol for dearomatizing nitroarenes was established.
  • Exclusive formation of dearomatized alicyclic products was achieved.
  • An enantioselective variant using chiral ligands was developed, demonstrating asymmetric catalysis.

Conclusions:

  • The described methodology provides a robust route to dearomatized alicyclic compounds from nitroarenes.
  • The reaction exhibits broad substrate scope, including heterocyclic and benzenoid systems.
  • The development of an enantioselective variant highlights a rare example of asymmetric catalytic dearomatization.