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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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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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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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Regioselectivity and Stereochemistry of Hydroboration02:36

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Related Experiment Video

Updated: May 25, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Surface hydroxyl-modulation for constructing isolated vanadium active species for propane dehydrogenation.

Fuwen Yang1, Jie Zhang1, Jinwei Chen2

  • 1College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.

Journal of Colloid and Interface Science
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

Surface hydroxyl groups effectively tune vanadium oxide (VOX) catalysts for propane dehydrogenation (PDH). This method enhances catalyst dispersion and activity, offering a new route for efficient PDH catalysis.

Keywords:
Propane dehydrogenationPropylene productionStructure-activity relationshipSurface hydroxylVanadium oxides

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Area of Science:

  • Heterogeneous Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Vanadium oxides (VOX) are promising alternatives to platinum and chromium in propane dehydrogenation (PDH).
  • Controlling the nanoscale coordination environment and polymerization of VOX remains a significant challenge for catalyst design.

Purpose of the Study:

  • To develop an efficient VOX catalyst with an adjustable polymeric degree for PDH.
  • To precisely regulate the physicochemical properties of VOX species through surface hydroxyl (OH) modulation on silicalite-1 (S-1).

Main Methods:

  • Surface hydroxyl-modulation technique to control the density and dispersion of OH groups on silicalite-1.
  • Characterization of VOX species, including their coordination environment, dispersion, and oxidation states.
  • Evaluation of catalytic performance in propane dehydrogenation under industrial conditions.

Main Results:

  • Hydroxyl groups facilitated the migration and anchoring of VOX, leading to highly dispersed, tetrahedrally coordinated VO4 sites.
  • OH regulation optimized surface V density, promoted electron-rich V3+ species, and favored isolated VOX active sites.
  • The optimal 5VOX/S-1_550 catalyst achieved high propane conversion (24.5%) and propylene selectivity (96.7%) with excellent stability.

Conclusions:

  • Surface hydroxyl-modulation is an effective strategy for designing highly dispersed VOX catalysts with tunable polymeric degrees.
  • This approach significantly enhances catalytic activity and stability for propane dehydrogenation.
  • The study provides a novel methodology for developing advanced VOX-based catalysts for PDH applications.