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Related Concept Videos

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

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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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

10.5K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
10.5K
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

9
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
9
Preparation of Epoxides03:00

Preparation of Epoxides

9.5K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Collaborative Interface Engineering of the WO3-MoO3 Heterostructure Enabling Accelerated CO2 Cycloaddition with

Chenyang Wu1, Lixia Wang1, Jie Shi2

  • 1School of Chemistry and Materials, Yangzhou University, Yangzhou, Jiangsu 225002, China.

Inorganic Chemistry
|March 2, 2026
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Summary
This summary is machine-generated.

A novel WO3-MoO3 heterostructure catalyst efficiently converts carbon dioxide (CO2) and styrene oxide into cyclic carbonates under solvent-free conditions. This advanced catalyst engineering enhances reaction rates and yields for sustainable chemical synthesis.

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Area of Science:

  • Materials Science
  • Catalysis
  • Green Chemistry

Background:

  • Heterogeneous catalysts are crucial for the atom-economical synthesis of cyclic carbonates via CO2 cycloaddition.
  • Developing efficient catalysts for solvent-free CO2 cycloaddition with epoxides remains a significant challenge.

Purpose of the Study:

  • To construct a WO3-MoO3 heterostructure for the solvent-free cycloaddition of CO2 with styrene oxide.
  • To investigate the catalytic performance and mechanism of the engineered heterostructure.

Main Methods:

  • Synthesis of a WO3-MoO3 heterostructure catalyst.
  • Solvent-free cycloaddition reaction of CO2 with styrene oxide.
  • Kinetic studies to determine apparent activation energy.
  • Catalyst characterization to understand structure-activity relationships.

Main Results:

  • The WO3-MoO3 heterostructure exhibited enhanced cycloaddition kinetics with a lower apparent activation energy (17.6 kJ mol-1) compared to pristine WO3 and MoO3.
  • Achieved a high styrene carbonate yield of 93.7% under solvent-free conditions.
  • Demonstrated good cycling stability, indicating catalyst durability.

Conclusions:

  • Heterostructure engineering of WO3-MoO3 effectively tailors active sites and electronic properties for improved CO2 cycloaddition.
  • The developed catalyst offers a promising strategy for high-performance CO2 fixation and cyclic carbonate synthesis.
  • This approach advances sustainable chemical synthesis through efficient CO2 utilization.