Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

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.

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.

Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...

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.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Chemogenetic Modulation of Luciferase Emission Color for Imaging and Sensing.

ACS sensors·2026

Same author

Interplay between high-energy quenching and state transitions in Chlamydomonas reinhardtii: a single-cell approach.

The New phytologist·2026

Same author

Versatile luminescence macroscope with dynamic illumination for photoactive systems.

Optics express·2025

Same author

A Reaction-Diffusion Frame for Accessing Metabolic O<sub>2</sub> Fluxes in Single Microalgal Cells with Low-Cost Wide-Field Imaging of Nanosensor Luminescence Lifetime.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2025

Same author

Borinic Acid-Based Fluorogenic Probes as an Alternative to the Amplex Red Assay for Real-Time H<sub>2</sub>O<sub>2</sub> Monitoring in Live Cells.

ACS chemical biology·2025

Same author

Optimizing reaction and transport fluxes in temperature-gradient-driven chemical reaction-diffusion systems.

Physical review. E·2025

Search research articles

Related Experiment Video

Updated: Jul 16, 2026

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Two-photon uncaging with the efficient 3,5-dibromo-2,4-dihydroxycinnamic caging group

Nathalie Gagey¹, Pierre Neveu, Ludovic Jullien

¹Département de Chimie (C.N.R.S. U.M.R. 8640), Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.

Angewandte Chemie (International Ed. in English)

|February 21, 2007

Summary

No abstract available in PubMed .

More Related Videos

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Published on: October 29, 2011

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Published on: January 17, 2019

Related Experiment Videos

Last Updated: Jul 16, 2026

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Published on: October 29, 2011

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Published on: January 17, 2019