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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.

¹H NMR: Long-Range Coupling

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

[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.

Stability of Conjugated Dienes

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

C–C Bond Formation: Aldol Condensation Overview

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Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.

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.

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Published on: November 9, 2019

Cross-dehydrogenative coupling (CDC): exploring C-C bond formations beyond functional group transformations.

¹Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada. cj.li@mcgill.ca

Accounts of Chemical Research

|February 18, 2009

Summary

This summary is machine-generated.

Synthetic chemists developed cross-dehydrogenative coupling (CDC) to form carbon-carbon bonds directly from C-H bonds. This approach enhances efficiency and sustainability in chemical synthesis.

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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Area of Science:

Organic Chemistry
Synthetic Chemistry
Catalysis

Background:

Carbon-carbon bond formation is fundamental to chemical synthesis.
Traditional methods often require preactivation and defunctionalization steps, reducing efficiency.
Innovations are needed to improve resource and energy efficiency, selectivity, and safety.

Purpose of the Study:

To describe the development of cross-dehydrogenative coupling (CDC) for direct C-H bond functionalization.
To showcase the formation of carbon-carbon bonds from two different C-H bonds under oxidative conditions.
To highlight the potential of CDC reactions to revolutionize synthetic strategies.

Main Methods:

Utilizing inexpensive catalysts like copper and iron salts.
Employing various oxidants such as hydrogen peroxide, dioxygen, and DDQ.
Focusing on the direct coupling of sp3 C-H bonds with other C-H bonds without preactivation.

Main Results:

Demonstrated CDC reactions involving amines, ethers, allylic/benzylic positions, and alkanes.
Showcased the tolerance of diverse functional groups within these reactions.
Achieved some CDC reactions under aqueous conditions, enhancing environmental compatibility.

Conclusions:

Developed a novel method for C-C bond formation via direct C-H functionalization, bypassing traditional preactivation steps.
Proposed in situ generation of intermediates, offering mechanistic insights.
Anticipate significant economic and ecological benefits for future chemical syntheses through CDC.