Related Experiment Video
Updated: Jan 10, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
1-Phenoxyanthrapyridone as an Arylotropy-Based Photochromic System
Igor D Poltavtsev1,2, Sergey A Chernenko3, Igor A Ushakov1
1A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Street, Irkutsk 664033, Russia.
Abstract:
A 1-phenoxy-3H-naphtho[1,2,3-de]quinoline-2,7-dione derivative exhibits photochromic properties, forming a colored product with bright orange fluorescence. The latter is a naphtho[1,2,3-de]quinolin-3-ium-1-olate derivative, formed via arylotropy. The structure requirements and side photoreactions of this novel photoswitching system are discussed.
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Cycloaddition Reactions: MO Requirements for Photochemical Activation
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Thermal and Photochemical Electrocyclic Reactions: Overview
Woodward–Hoffmann Selection Rules and Microscopic Reversibility
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)