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Related Concept Videos

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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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.1K
Catalysis02:50

Catalysis

30.0K
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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Phase II Conjugation Reactions: Overview01:14

Phase II Conjugation Reactions: Overview

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Conjugation, a key component of phase II biotransformation reactions, is a vital process in drug detoxification. It involves transferring endogenous substances like glucuronic acid, sulfate, and glycine to drugs or their metabolites formed in phase I reactions. These conjugation reactions, often catalyzed by specific enzymes, transform potentially harmful metabolites into inactive, water-soluble forms easily excreted in urine or bile. By enhancing polarity and eliminating pharmacological...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K

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Cooperative triple catalysis for complex molecule construction and late-stage functionalization.

Vasudevan Dhayalan1

  • 1Department of Chemistry, National Institute of Technology Puducherry, Karaikal-609609, Puducherry, India. dhaya.chem@nitpy.ac.in.

Organic & Biomolecular Chemistry
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Triple catalysis, merging three catalytic cycles, offers efficient and selective bond-forming reactions. This powerful strategy expands synthetic chemistry, enabling new transformations for drug discovery and materials science.

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Area of Science:

  • Synthetic Chemistry
  • Catalysis
  • Organic Chemistry

Background:

  • Modern catalysis enables efficient C-C, C-N, C-O, and C-H bond formation.
  • Triple catalysis synergistically merges three distinct catalytic cycles.
  • Addresses challenges in reactivity, chemo-, regio-, and enantioselectivity.

Purpose of the Study:

  • To provide a comprehensive overview of triple catalysis.
  • To cover design, catalysts, mechanisms, and applications.
  • To highlight advances in various synthetic transformations.

Main Methods:

  • Merging photoredox, transition-metal, organocatalysis, or hydrogen atom transfer (HAT) cycles.
  • Developing cooperative catalytic systems.
  • Reviewing recent literature on triple catalysis.

Main Results:

  • Enables rapid access to previously unattainable transformations under mild conditions.
  • Expands chemical space with unconventional bond constructions.
  • Improves reaction efficiency, substrate scope, and functional group tolerance.

Conclusions:

  • Triple catalysis is a frontier strategy reshaping synthetic methodologies.
  • Cooperative systems drive next-generation drug discovery and materials science.
  • Facilitates complex molecule construction and late-stage functionalization.