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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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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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β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Introduction
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Atomically precise single-atom cobalt photocatalyst for enhanced decarboxylative cross-couplings.

Qian Yang1, Mengting Wu1, Wanlin Wang1

  • 1School of Chemistry and Chemical Engineering, Chongqing University 174 Shazheng Street Chongqing 400044 China yf.cai@cqu.edu.cn.

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|September 24, 2025
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Summary

Researchers developed novel cobalt-based single-atom photocatalysts (SAPs) for efficient decarboxylative Heck-type coupling reactions. These heterogeneous catalysts show high activity, selectivity, and reusability in sustainable chemical synthesis.

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Area of Science:

  • Heterogeneous photocatalysis
  • Sustainable chemical synthesis
  • Organometallic chemistry

Background:

  • Single-atom photocatalysts (SAPs) offer enhanced activity and selectivity for organic transformations.
  • Developing efficient and reusable heterogeneous catalysts is crucial for sustainable chemistry.
  • Decarboxylative coupling reactions are important for C-C bond formation.

Purpose of the Study:

  • To fabricate and apply novel cobalt-based single-atom photocatalysts (SAPs) for decarboxylative Heck-type coupling reactions.
  • To investigate the synergistic effects between atomically dispersed cobalt and photoactive supports.
  • To achieve efficient and selective synthesis of multi-substituted alkenes using a heterogeneous system.

Main Methods:

  • Fabrication of cobalt-based SAPs (CoSA-K-PHI) via a mild Co/K exchange approach on potassium poly(heptazine imide).
  • Utilizing the CoSA-K-PHI catalyst in decarboxylative Heck-type coupling reactions of carboxylic acids with olefins.
  • Characterization of catalyst performance, stability, and reusability.

Main Results:

  • The optimal SAP catalyst demonstrated exceptional activity and selectivity in decarboxylative Heck couplings, even at low cobalt loading.
  • The catalyst exhibited high stability and could be recycled at least six times without performance loss.
  • The heterogeneous metallaphotocatalytic protocol enabled the synthesis of diverse alkenes, including late-stage functionalization of natural products.

Conclusions:

  • Cobalt-based SAPs supported on ionic carbon nitride are effective heterogeneous catalysts for decarboxylative Heck-type coupling reactions.
  • Synergistic interactions between single-atomic cobalt and the photoactive support enhance catalytic performance.
  • This approach provides a sustainable and efficient method for synthesizing valuable organic compounds.