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Related Concept Videos

Acid Halides to Ketones: Gilman Reagent01:14

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Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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A merged copper(I/II) cluster isolated from Glaser coupling.

Siqi Zhang1, Liang Zhao2

  • 1Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China.

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|October 26, 2019
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Researchers created a novel copper cluster with strong oxidation capabilities, enabling efficient hydrogen atom transfer reactions with hydrocarbons. This discovery advances understanding of copper-oxygen chemistry in catalysis.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Copper-oxygen species are crucial for various oxidation reactions in biological and chemical systems.
  • Understanding the reactivity of mixed-valence copper clusters is key to developing new catalysts.

Purpose of the Study:

  • To construct and characterize a novel macrocycle-protected mixed-valence copper cluster.
  • To investigate the oxidation capacity and reactivity of the synthesized cluster, particularly its hydrogen atom transfer (HAT) capabilities.

Main Methods:

  • Synthesis of a macrocycle-protected mixed-valence copper cluster by merging a copper acetylide cluster and a copper-oxygen moiety.
  • Electrochemical analysis to determine reduction potential.
  • Reactivity studies with inert hydrocarbons.
  • Theoretical calculations (Density Functional Theory) to elucidate electronic structure and bonding.

Main Results:

  • Successfully synthesized the [(tBuC≡CCuI3)-(μ2-OH)-CuII] cluster.
  • The cluster exhibited exceptionally high oxidation capacity and reduction potential, comparable to some Cu(III) species.
  • Demonstrated significant hydrogen atom transfer (HAT) reactivity with inert hydrocarbons.
  • A degraded analogue lacking the copper acetylide unit showed no HAT reactivity.
  • Theoretical calculations revealed that uneven charge distribution in the Cu(I) ions, due to back donation, enhances the Cu(II) oxidation ability.

Conclusions:

  • The synthesized mixed-valence copper cluster possesses remarkable oxidative power and HAT reactivity.
  • The electronic structure, particularly the charge distribution influenced by copper acetylide, is critical for its enhanced reactivity.
  • This work provides insights into in situ metal cluster formation and opens avenues for mechanistic studies in copper-catalyzed reactions.