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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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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 are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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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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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Photocatalytic Methanol Dehydrogenation with Switchable Selectivity.

Jie Luo1,2, Cheng Zhu2,3,4,5, Jialu Li6

  • 1Department of Chemistry, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|January 13, 2025
PubMed
Summary
This summary is machine-generated.

This study demonstrates switchable selectivity in photocatalytic methanol dehydrogenation using zinc indium sulfide nanocrystals. By adjusting nickel cocatalyst concentration, researchers can produce either formaldehyde or ethylene glycol, advancing sustainable chemical synthesis.

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Area of Science:

  • Materials Science
  • Catalysis
  • Photochemistry

Background:

  • Switchable selectivity in photocatalysis is crucial for sustainable chemical transformations and renewable energy.
  • Developing efficient photocatalytic systems with tunable product selectivity remains a key challenge.

Purpose of the Study:

  • To investigate switchable selectivity in photocatalytic methanol dehydrogenation using zinc indium sulfide (ZnIn2S4) nanocrystals.
  • To control the selective production of formaldehyde or ethylene glycol by varying nickel (Ni) cocatalyst concentration.

Main Methods:

  • Utilizing ZnIn2S4 nanocrystals as the semiconductor photocatalyst.
  • Employing photocatalytic methanol dehydrogenation with varying concentrations of nickel cocatalyst.
  • Conducting control experiments and mechanistic studies to understand selectivity determinants.

Main Results:

  • Achieved high selectivity for either formaldehyde or ethylene glycol production by adjusting nickel concentration.
  • Identified formaldehyde as an initial product and potential intermediate for ethylene glycol formation.
  • Revealed the dual role of nickel: as a hydrogen evolution reaction cocatalyst and an ionic photoelectron competitor influencing selectivity.

Conclusions:

  • Demonstrated a versatile photocatalytic system with switchable selectivity for methanol conversion.
  • Provided new insights into the mechanistic role of cocatalysts in controlling photocatalytic product distribution.
  • Opened avenues for producing diverse chemicals from methanol through tailored catalytic design.