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Related Concept Videos

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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 Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
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.
7.8K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

12.0K
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.
12.0K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Updated: Jul 27, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Metallaphotoredox catalysis for sp

Jingchang Zhang1, Magnus Rueping2

  • 1Department of Chemistry, School of Pharmacy, Jining Medical University, Rizhao 276826, China. zhangjingchang84@mail.jnmc.edu.cn.

Chemical Society Reviews
|June 6, 2023
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Summary
This summary is machine-generated.

Photocatalytic hydrogen atom transfer (HAT) combined with transition metal catalysis enables efficient C-H bond formation. This review highlights recent advances in sp3 C-H functionalization strategies and their synthetic applications.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Green Chemistry

Background:

  • Photocatalytic hydrogen atom transfer (HAT) and transition metal catalysis are powerful tools in organic synthesis.
  • Their integration offers novel pathways for constructing complex molecules.

Purpose of the Study:

  • To review recent advancements in sp3 C-H functionalization using photocatalytic HAT and transition metal catalysis.
  • To discuss diverse synthetic strategies, applications, and reaction mechanisms.

Main Methods:

  • Summarizing recent literature on photocatalytic HAT followed by transition metal catalysis.
  • Analyzing reaction mechanisms for rational catalyst design.

Main Results:

  • Demonstrated the broad applicability of combined photocatalysis and transition metal catalysis for C(sp3)-carbon and C(sp3)-hetero bond formation.
  • Highlighted various synthetic strategies and their applications in organic synthesis.

Conclusions:

  • Understanding reaction mechanisms is key to improving catalyst efficiency.
  • This approach holds significant potential for green chemistry, drug discovery, and material science.