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Related Concept Videos

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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.
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[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.

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Inner-Bond Cleavage of Sterically Congested Dibenzo[g,p]chrysene to a Rigid Figure-Eight Macrocycle.

Joe Kambara1, Taito Moribe1, Tomoyuki Ikai1

  • 1Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, and Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.

Organic Letters
|June 11, 2026
PubMed
Summary

Ruthenium catalysis enables efficient cleavage of a tetramethyl-substituted polycyclic aromatic hydrocarbon. This yields a chiral cyclic diketone with enhanced optical properties and synthetic advantages.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Area of Science:

  • Organic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are challenging substrates for selective functionalization.
  • Steric hindrance in PAHs often complicates synthetic transformations.
  • Developing efficient methods for creating complex chiral molecules from PAHs is of significant interest.

Purpose of the Study:

  • To investigate the ruthenium-catalyzed oxidative inner-bond cleavage of a sterically congested PAH.
  • To synthesize and characterize the resulting cyclic diketone.
  • To explore the impact of methyl substitution on the molecule's properties and synthetic utility.

Main Methods:

  • Ruthenium-catalyzed oxidative inner-bond cleavage reaction.
  • Synthesis of 1,8,9,16-tetramethyldibenzo[g,p]chrysene.
  • Characterization of the product using spectroscopic techniques.
  • Evaluation of optical properties of π-extended derivatives.

Main Results:

  • Excellent yield of 4,13,17,26-tetramethylcyclobisbiphenylenecarbonyl achieved.
  • The cyclic diketone exhibits robust chirality due to enhanced structural rigidity from methyl groups.
  • Methyl substitution facilitated a shorter bond-cleavage step and regioselective C-H borylation.

Conclusions:

  • Ruthenium catalysis provides an effective route for the synthesis of complex chiral diketones from sterically hindered PAHs.
  • The synthesized molecule possesses inherent chirality and potential for applications in materials science.
  • Methyl group substitution offers significant advantages for both synthesis and property tuning.