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Related Concept Videos

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.
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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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.
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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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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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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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Updated: Apr 18, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Asymmetric catalysis activated by visible light.

Eric Meggers1

  • 1Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35043 Marburg, Germany. meggers@chemie.uni-marburg.de.

Chemical Communications (Cambridge, England)
|January 10, 2015
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Summary
This summary is machine-generated.

Visible light catalysis enables efficient asymmetric synthesis. Recent advances combine light activation with asymmetric catalysis using single or dual catalyst systems for greener chiral compound production.

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Area of Science:

  • Organic chemistry
  • Photocatalysis
  • Asymmetric catalysis

Background:

  • Visible light organic chemistry has gained significant attention.
  • Asymmetric catalysis is crucial for synthesizing chiral compounds.
  • Combining these fields offers novel synthetic routes.

Purpose of the Study:

  • To review recent progress in visible light-driven asymmetric catalysis.
  • To highlight methods using photoinduced electron or energy transfer.
  • To discuss the use of single versus dual catalyst systems.

Main Methods:

  • Literature review of recent advancements.
  • Focus on processes mediated by photoinduced electron or energy transfer.
  • Analysis of dual and single catalyst systems.

Main Results:

  • Visible light activation combined with asymmetric catalysis is effective.
  • Both dual and single catalyst systems have been successfully employed.
  • Novel asymmetric transformations under mild conditions have been discovered.

Conclusions:

  • Visible light-driven asymmetric catalysis is a rapidly advancing field.
  • This approach offers economical and environmentally friendly routes to chiral compounds.
  • Future developments hold promise for sustainable synthesis.