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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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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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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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Catalysis02:50

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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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Recent Progress on In Situ Catalytic Conversion Catalysts for Oil Shale.

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Developing catalysts for in situ oil shale conversion is crucial for energy security. This review highlights catalyst research progress, aiming to improve oil shale extraction efficiency and reduce environmental impact.

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Area of Science:

  • Chemical Engineering
  • Energy Science
  • Geology

Background:

  • Global oil depletion necessitates developing unconventional and renewable energy sources.
  • Oil shale represents an abundant unconventional resource vital for energy security.
  • Current oil shale extraction methods include surface dry distillation and in situ transformation.

Purpose of the Study:

  • To review recent advancements in catalyst research for in situ oil shale catalytic conversion.
  • To provide insights into catalyst types, design principles, and reaction mechanisms.
  • To identify future research directions for practical oil shale development.

Main Methods:

  • Literature review of catalyst research in in situ oil shale conversion.
  • Analysis of catalyst types, design principles, and reaction mechanisms.
  • Discussion of challenges and future prospects for catalyst application.

Main Results:

  • Catalysts are critical for enhancing the rate, selectivity, and product quality in oil shale pyrolysis.
  • Existing catalyst research is primarily laboratory-based, facing challenges in practical application.
  • Emerging in situ catalytic conversion offers potential for improved efficiency, cost reduction, and environmental benefits.

Conclusions:

  • Catalyst development is key to unlocking the potential of oil shale as a strategic energy resource.
  • Further research is needed to bridge the gap between laboratory findings and industrial application of catalysts.
  • Advancing catalyst technology supports the green development of unconventional energy and global energy transition.