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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.

[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.

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

Electrophilic 1,2- and 1,4-Addition of X₂ to 1,3-Butadiene

Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.

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.

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.

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...

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Updated: Apr 3, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

General Route to Cyclobutadiene Rhodium Complexes.

Dmitry S Perekalin¹, Nikita V Shvydkiy¹, Yulia V Nelyubina¹

¹Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., 119991, Moscow (Russia).

Chemistry (Weinheim an Der Bergstrasse, Germany)

|September 22, 2015

Summary

New cyclobutadiene rhodium complexes are synthesized in one step. These complexes offer versatile access to various organometallic compounds and demonstrate catalytic activity in cycloisomerization reactions.

Keywords:

cyclobutadienes diene ligands homogeneous catalysis rhodium sandwich complexes

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Synthesis of a Water-soluble Metal–Organic Complex Array

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

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Last Updated: Apr 3, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Synthesis of a Water-soluble Metal–Organic Complex Array

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

Area of Science:

Organometallic Chemistry
Catalysis
Synthetic Chemistry

Background:

Cyclobutadiene rhodium complexes are valuable in synthesis and catalysis.
Developing efficient synthetic routes to these complexes is crucial.

Purpose of the Study:

To develop a facile one-step synthesis for cyclobutadiene rhodium complexes with labile p-xylene ligands.
To explore the utility of these complexes as precursors for other organometallic compounds.
To investigate their catalytic potential in organic transformations.

Main Methods:

One-step synthesis utilizing bis(ethylene) rhodium chloride dimer, p-xylene, and internal alkynes.
Ligand exchange reactions to generate diverse cyclobutadiene rhodium derivatives.
Catalytic testing of a specific complex in a cycloisomerization reaction.

Main Results:

Successful one-step synthesis of [(C4 R4 )Rh(p-xylene)](+) complexes.
Demonstrated general access to various [(C4 R4 )Rh] compounds via ligand substitution.
[(C4 Et4 )Rh(p-xylene)](+) catalyzed an unusual cycloisomerization of a dien-yne.

Conclusions:

The developed method provides a versatile route to cyclobutadiene rhodium complexes.
These complexes serve as valuable synthons for a range of organometallic structures.
The catalytic application highlights the potential of these complexes in novel organic transformations.