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Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
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Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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When a carbonyl compound is treated with a strong base, the α position gets deprotonated to give a resonance-stabilized intermediate called an enolate. Enolates are ambident nucleophiles because they possess two nucleophilic sites that can attack an electrophile owing to the delocalization of the negative charge between the α carbon and oxygen atoms. When the oxygen atom attacks an electrophile, it is called O-attack, whereas electrophilic attack via the α carbon is known as...
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Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions...
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Catalytic ozonation mechanism over M1-N3C1 active sites.

Dingren Ma1, Qiyu Lian1, Yexing Zhang1

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This study clarifies structure-activity relationships in catalytic ozonation using single-atom catalysts. Surface atomic oxygen reactivity and peroxide dissociation barriers are key descriptors for catalyst design and ozone decomposition.

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • The structure-activity relationship in catalytic ozonation is poorly understood, limiting the development of effective catalysts.
  • Ozone (O3) is a powerful oxidant used in water treatment and air purification.

Purpose of the Study:

  • To investigate the structure-activity relationship in catalytic ozonation using well-defined single-atom catalysts.
  • To identify descriptors for optimizing catalyst performance in ozone-based applications.

Main Methods:

  • Synthesis of single-atom catalysts with M1-N3C1 (M: Mn, Fe, Co, Ni) active sites.
  • In situ characterization techniques and theoretical calculations.
  • Evaluation of catalytic activity in ozonation and ozone decomposition.

Main Results:

  • Single-atom catalysts exhibited significantly higher catalytic activity (over 527x) compared to commercial manganese dioxide.
  • Surface atomic oxygen reactivity was identified as a descriptor for catalytic ozonation activity.
  • The dissociation barrier of surface peroxide species correlated with ozone decomposition activity.

Conclusions:

  • The study provides atomic-level mechanistic insights into catalytic ozonation.
  • Identified descriptors offer guidelines for designing high-performance catalysts for ozone and methyl mercaptan control.
  • This work advances the understanding of structure-activity relationships in single-atom catalysis.