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Radical Oxidation of Allylic and Benzylic Alcohols01:21

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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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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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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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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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MoSe2 promoted PtRu catalysis for efficient methanol electrooxidation.

Yang Zhou1, Wei Qiao1, Yajing Xie1

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Chemical Communications (Cambridge, England)
|May 28, 2025
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Summary

Strong coupling of platinum-ruthenium (PtRu) with molybdenum diselenide (MoSe2) enhances its anti-carbon monoxide (CO) poisoning ability and methanol oxidation performance. This creates a more efficient catalyst for fuel cells.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum diselenide (MoSe2) is a promising material for catalysis.
  • Platinum-ruthenium (PtRu) alloys are widely used in methanol electrooxidation.
  • Carbon monoxide (CO) poisoning remains a challenge for Pt-based catalysts.

Purpose of the Study:

  • To investigate the effect of strong coupling between PtRu and MoSe2 on catalytic performance.
  • To enhance the anti-CO poisoning ability of PtRu catalysts.
  • To improve the methanol oxidation reaction (MOR) activity.

Main Methods:

  • Synthesis of PtRu nanoparticles supported on MoSe2 nanosheets.
  • Electrochemical characterization techniques, including cyclic voltammetry and chronoamperometry.
  • Surface analysis to confirm strong coupling and electronic interactions.

Main Results:

  • Strong electronic coupling was observed between PtRu and MoSe2.
  • The PtRu/MoSe2 catalyst exhibited enhanced resistance to CO poisoning compared to pure PtRu.
  • Significantly improved methanol oxidation performance was achieved.

Conclusions:

  • Strong coupling between PtRu and MoSe2 effectively enriches the electron density of Pt sites.
  • This electronic modification enhances catalytic activity and durability for methanol oxidation.
  • PtRu/MoSe2 is a promising catalyst for direct methanol fuel cells.