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Related Concept Videos

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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Factors Influencing the Rate of Chemical Reactions01:22

Factors Influencing the Rate of Chemical Reactions

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A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another....
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Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

4.4K
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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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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Self-Adaptable Tropos Catalysts.

Montserrat Diéguez1, Oscar Pàmies1, Christina Moberg2

  • 1Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo 1, 43007 Tarragona, Spain.

Accounts of Chemical Research
|August 4, 2021
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Summary

Synthetic catalysts inspired by nature can adapt their shape to bind diverse substrates, overcoming limitations of traditional selective catalysts. This research focuses on flexible ligands for adaptable metal catalysts with broad applications.

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Area of Science:

  • Catalysis
  • Organometallic Chemistry
  • Supramolecular Chemistry

Background:

  • Enzyme active sites exhibit high substrate specificity, often explained by the lock-and-key model.
  • This specificity, while enhancing selectivity, limits the range of substrates a catalyst can process.
  • Biological systems demonstrate adaptability, changing shape to accommodate new environments and substrates.

Purpose of the Study:

  • To design synthetic catalysts that mimic biological adaptability for a wider substrate scope.
  • To investigate how metal catalysts with flexible ligands adjust their binding pockets.
  • To develop self-adaptive ligands for versatile catalytic applications.

Main Methods:

  • Exploration of ligands featuring tropos biaryl units for metal catalysts.
  • Utilizing palladium-catalyzed allylic alkylation as a model reaction system.
  • Employing experimental and theoretical methods to study metal complex conformations.

Main Results:

  • Demonstrated that flexible ligands enable metal catalysts to adapt their binding pockets to various substrates.
  • Showcased the effectiveness of ligands with two flexible units in facilitating conformational analysis.
  • A tropos biaryl phosphite ligand significantly enhanced catalytic scope compared to a traditional phosphine ligand.

Conclusions:

  • Catalyst flexibility is key to achieving broad substrate scope and adaptability.
  • Self-adaptive ligands can be designed to overcome the limitations of rigid catalytic sites.
  • This approach offers a pathway to developing more versatile and efficient synthetic catalysts.