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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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.
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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...
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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 rearrangements are...

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Related Experiment Video

Updated: Jul 9, 2026

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
11:44

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Sequential palladium-catalyzed coupling reactions on solid-phase.

Takayuki Doi1, Hitoshi Inoue, Masatoshi Tokita

  • 1Department of Applied Chemistry, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8552, Japan.

Journal of Combinatorial Chemistry
|December 7, 2007
PubMed
Summary

This study demonstrates palladium-catalyzed coupling reactions on a polymer support to synthesize conjugated aromatic systems. These novel compounds are key components for creating advanced rodlike liquid crystals.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Palladium-catalyzed coupling reactions are essential tools in organic synthesis.
  • Developing efficient methods for synthesizing complex organic molecules is crucial for materials science.
  • Liquid crystals with specific structural properties are of significant interest.

Purpose of the Study:

  • To explore the application of six palladium-catalyzed coupling reactions on a polymer support.
  • To synthesize conjugated aromatic ring systems for liquid crystal applications.
  • To develop a combinatorial approach for generating diverse molecular structures.

Main Methods:

  • Performed Mizoroki-Heck, Migita-Stille, Sonogashira, carbonylative esterification, carbonylative Stille, and carbonylative Sonogashira reactions.
  • Utilized a polymer support for carrying out the coupling reactions.
  • Employed a combinatorial approach for reactions involving substituted aromatic rings and anisol derivatives.

Main Results:

  • Successfully synthesized conjugated aromatic ring systems 1 and 2.
  • Demonstrated the versatility of palladium-catalyzed coupling reactions on a polymer support.
  • Obtained core structures suitable for rodlike liquid crystals.

Conclusions:

  • Palladium-catalyzed coupling reactions on polymer supports offer an efficient route to complex organic molecules.
  • The synthesized conjugated aromatic systems are valuable precursors for liquid crystal materials.
  • This methodology facilitates the combinatorial synthesis of potential liquid crystal components.