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Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

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.

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

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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Updated: Jun 23, 2025

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology

Published on: March 12, 2015

Ferrocene Derivatives for Photothermal Applications.

Yue Hu^1,2, Zhou Fang^1,2, Bing Yao^1,2

¹State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.

|June 17, 2024

Summary

Ferrocene (Fc) derivatives show promise for photothermal conversion. This review highlights their synthesis, mechanisms, and recent applications in areas like therapies and catalysis.

Keywords:

Ferrocene and derivatives Photothermal CO2 separation Photothermal remediation Photothermal therapy Solar-driven water production

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Last Updated: Jun 23, 2025

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Area of Science:

Materials Science
Chemistry
Nanotechnology

Background:

Ferrocene (Fc) and its derivatives are increasingly recognized for their unique structural and chemical properties.
Photothermal conversion is a key energy conversion pathway attracting significant research interest.
Fc-based materials offer versatile platforms for developing advanced photothermal agents.

Purpose of the Study:

To systematically review ferrocene (Fc) and Fc derivatives with photothermal characteristics.
To summarize synthesis methods and photothermal conversion mechanisms.
To highlight recent advances and applications of Fc-based photothermal materials.

Main Methods:

Review of literature on Fc derivatives and their photothermal properties.
Systematic discussion of synthetic approaches for Fc-based materials.
Summary of the photothermal conversion mechanism via nonradiative relaxation.

Main Results:

Fc derivatives exhibit significant photothermal conversion capabilities.
Recent applications span photothermal degradation, antibacterial effects, therapies, catalysis, water production, and CO2 separation.
Diverse synthetic strategies enable tailored Fc-based photothermal materials.

Conclusions:

Ferrocene-based materials possess considerable potential for diverse photothermal applications.
Further research into Fc derivatives can unlock new avenues in energy conversion and therapeutic strategies.
This review provides a comprehensive overview for researchers in the photothermal field.