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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.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.

Thermal Electrocyclic Reactions: Stereochemistry

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

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.

Preparation of Epoxides

Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy...

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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Related Experiment Video

Updated: Apr 19, 2026

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

Silver-catalyzed C(sp2)-H functionalization/C-O cyclization reaction at room temperature.

Jian-Jun Dai¹, Wen-Tao Xu, Ya-Dong Wu

¹School of Medical Engineering, Hefei University of Technology , Hefei 230009, P. R. China.

The Journal of Organic Chemistry

|December 16, 2014

Summary

A new silver-catalyzed reaction enables C-H functionalization and C-O cyclization at room temperature. This scalable method efficiently produces various lactones with good functional group tolerance, potentially proceeding via a radical pathway.

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Area of Science:

Organic Chemistry
Catalysis
Green Chemistry

Background:

C-H functionalization is a key strategy in organic synthesis.
Developing mild and efficient catalytic systems remains a challenge.
Lactone synthesis is important for pharmaceuticals and materials.

Purpose of the Study:

To develop a novel silver-catalyzed method for C(sp2)-H functionalization/C-O cyclization.
To achieve mild reaction conditions, including room temperature and open flask.
To synthesize diverse lactones with high yields and functional group compatibility.

Main Methods:

Utilizing a silver nitrate (AgNO3) catalyst.
Employing ammonium persulfate ((NH4)2S2O8) as an oxidant.
Conducting the reaction in a CH2Cl2/H2O solvent system at room temperature.
Analyzing the reaction mechanism using kinetic isotope effect (KIE) studies.

Main Results:

Successful development of a silver-catalyzed C(sp2)-H functionalization/C-O cyclization reaction.
The reaction is scalable and proceeds efficiently at room temperature in an open system.
Good to excellent yields of various lactones were obtained.
The method demonstrates broad functional group compatibility due to mild conditions.
KIE studies suggest a radical process is involved in the reaction mechanism.

Conclusions:

A novel, scalable, and mild silver-catalyzed protocol for lactone synthesis has been established.
The reaction offers a practical approach for accessing diverse lactones.
The findings contribute to the advancement of C-H functionalization and catalytic cyclization strategies.
The proposed radical mechanism warrants further investigation.