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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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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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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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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Hydroquinone-treated Cu3(BTC)2: a mixed-valence Cu(I/II) MOF catalyst for efficient cycloadditions.

Sun Ho Park1, Hye Mi Kim1, Mariana L Díaz-Ramírez1,2

  • 1Department of Physics & Chemistry, DGIST, Daegu 42988, Korea. sunggi.lee@dgist.ac.kr.

Chemical Communications (Cambridge, England)
|November 7, 2024
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Summary

We developed a novel mixed-valence copper metal-organic framework (MOF), Cu(I/II)-HKUST-1, for enhanced catalysis. This sustainable MOF shows superior performance in the copper-catalyzed azide-alkyne cycloaddition reaction.

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Area of Science:

  • Materials Science
  • Catalysis
  • Coordination Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable properties for catalysis.
  • HKUST-1 (Cu(II)3(BTC)2) is a well-known MOF with catalytic potential.
  • Mixed-valence metal centers can impart unique reactivity.

Purpose of the Study:

  • To synthesize and characterize a mixed-valence copper MOF, Cu(I/II)-HKUST-1.
  • To evaluate the catalytic performance of Cu(I/II)-HKUST-1 in the copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction.
  • To explore the potential of mixed-valence Cu-based MOFs as sustainable heterogeneous catalysts.

Main Methods:

  • Post-synthetic modification of Cu(II)3(BTC)2 (HKUST-1) using hydroquinone (H2Q) treatment.
  • Characterization of the resulting mixed-valence Cu(I/II)-HKUST-1.
  • Catalytic testing of Cu(I/II)-HKUST-1 in the CuAAC reaction between phenylacetylene and benzyl azide.

Main Results:

  • Successful synthesis of mixed-valence Cu(I)1Cu(II)2(BTC)2 (Cu(I/II)-HKUST-1) with preserved structural integrity.
  • Demonstrated superior catalytic activity of Cu(I/II)-HKUST-1 in the CuAAC reaction compared to parent materials.
  • Phenylacetylene and benzyl azide efficiently reacted using the novel catalyst.

Conclusions:

  • Mixed-valence Cu-based MOFs, like Cu(I/II)-HKUST-1, exhibit excellent structural stability.
  • Cu(I/II)-HKUST-1 serves as a highly effective and sustainable heterogeneous catalyst for organic transformations.
  • This work advances the application of MOFs in catalysis, particularly for CuAAC reactions.