Related Experiment Video
Updated: May 22, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Approaching a stable, green twisted heteroacene through "clean reaction" strategy
Gang Li1, Hieu M Duong, Zhonghan Zhang
1School of Materials Science Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore.
Abstract:
A new, longest, stable, green twisted heteroacene 2-methyl-1,4,6,13-tetraphenyl-7:8,11:12-bisbenzo-anthro[g]isoquinolin-3(2H)-one (3) was synthesized by employing a "clean reaction" strategy based on thermally eliminating lactam bridges. Calculation shows that the HOMO-LUMO bandgap is in good agreement with experimental data.
Related Concept Videos
Thermal Electrocyclic Reactions: Stereochemistry
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.
Thermal and Photochemical Electrocyclic Reactions: Overview
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
Halogenation of Alkenes
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

