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

[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.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Cycloaddition Reactions: Overview

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.

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

Preparation and Reactions of Sulfides

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.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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Related Experiment Video

Updated: Aug 28, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Modular silacyclopropenes: synthesis and application for Si-H containing substrate functionalization.

Matthias Nobis^1,2, Shigeyoshi Inoue², Bernhard Rieger^1,2

¹Technical University of Munich, WACKER-Chair of Macromolecular Chemistry Lichtenbergstraße 4, 85748, Garching bei München, Germany. rieger@tum.de.

Chemical Communications (Cambridge, England)

|September 15, 2022

Summary

A new method functionalizes silicon-hydrogen substrates using vinyl silacyclopropenes. This creates versatile, multi-functional silacyclopropene derivatives for diverse material applications.

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Published on: February 7, 2019

Area of Science:

Organosilicon Chemistry
Materials Science

Background:

Functionalization of silicon-hydrogen (Si-H) bonds is crucial for developing novel materials.
Existing methods may lack efficiency or versatility in creating complex silicon-containing structures.

Purpose of the Study:

To develop an efficient and versatile method for functionalizing Si-H containing substrates.
To synthesize novel multi-functional silacyclopropene derivatives.
To explore the potential applications of these new materials.

Main Methods:

Reaction of Si-H containing substrates with vinyl substituted silacyclopropenes.
Characterization of the resulting multi-functional silacyclopropene derivatives.

Main Results:

Successful development of a method to functionalize Si-H substrates.
Generation of a range of multi-functional silacyclopropene derivatives, from small molecules to polymers.
Demonstration of the versatility of the developed technique.

Conclusions:

A new, efficient, and versatile method for synthesizing functionalized silacyclopropenes has been established.
This provides access to a new class of functional materials with potential applications in various fields.
The developed technique is applicable to both small molecules and polymeric materials like polysiloxanes.