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Related Concept Videos

Catalysis02:50

Catalysis

26.9K
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.
26.9K
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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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

8.3K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
8.3K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.1K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Multi-Stimuli-Responsive Network of Multicatalytic Reactions using a Single Palladium/Platinum Catalyst.

Gracjan Kurpik1,2, Anna Walczak1,2, Paweł Dydio3,4

  • 1Center for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614, Poznań, Poland.

Angewandte Chemie (International Ed. in English)
|June 15, 2024
PubMed
Summary

Nature inspires a new stimuli-responsive catalytic network. This system uses a palladium/platinum complex to selectively synthesize ten products from simple materials, mimicking biological adaptability in organic chemistry.

Keywords:
cooperative catalysisheteronuclear complexesmulti-stage reactionsmulticatalytic systemstransition metals

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Biomimetic Chemistry

Background:

  • Nature efficiently synthesizes complex molecules and adapts metabolic processes based on cellular needs.
  • Chemists aim to replicate nature's ability to control synthetic pathways with external stimuli.

Purpose of the Study:

  • To develop a metabolism-inspired, stimuli-responsive multicatalytic system.
  • To demonstrate controllable synthesis of diverse products using a single catalytic complex.

Main Methods:

  • A multifunctional heteronuclear palladium(II)/platinum(II) complex was synthesized.
  • A network of four catalytic reaction classes (cross-couplings, substitutions, additions, reductions) was established.
  • Organic starting materials (terminal alkyne, aryl iodide, hydrosilane) were used with controlled addition.

Main Results:

  • The catalytic network selectively synthesized ten distinct products.
  • Product formation was controlled by specific additives and external stimuli.
  • High efficiency and selectivity were achieved through simultaneous triggering and suppression mechanisms.

Conclusions:

  • The developed system successfully mimics nature's adaptive metabolic control.
  • This approach offers a powerful strategy for controllable and selective organic synthesis.
  • The multifunctional catalyst enables orthogonal reaction pathways within a single system.