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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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.
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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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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.
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Introduction
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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.
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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.
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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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Cyclization Synthetic Methodologies for Triphenylene Derivatives.

Hui-Cheng Cheng1,2, Jiao-Li Ma1,2, Peng-Hu Guo1

  • 1College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China.

Chemistry, an Asian Journal
|October 15, 2025
PubMed
Summary

Efficient synthesis of triphenylene frameworks, crucial for optoelectronics, is advancing. Recent palladium-catalyzed C─H activation and photoredox methods offer milder conditions and improved control for polycyclic aromatic hydrocarbons (PAHs).

Keywords:
Cyclization strategyPhotoinduced synthesisSynthetic methodsTransition metal catalysisTriphenylene derivatives

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Triphenylene frameworks are essential building blocks in optoelectronics, bioactives, and supramolecular engineering.
  • Conventional synthesis of triphenylene-based polycyclic aromatic hydrocarbons (PAHs) faces challenges like harsh conditions, poor regioselectivity, and limited functional group tolerance.
  • While transition metal-catalyzed C─H activation improved efficiency, it relies on precious metals and faces scalability issues.

Purpose of the Study:

  • To systematically review recent advancements in triphenylene synthesis.
  • To highlight progress in palladium-catalyzed C─H activation and radical-mediated photoredox cascade methodologies.
  • To examine regiochemical control, synthetic applications, limitations, and mechanisms for future development.

Main Methods:

  • Review of literature on triphenylene synthesis methodologies.
  • Focus on palladium-catalyzed C─H activation strategies.
  • Analysis of radical-mediated photoredox cascade reactions.

Main Results:

  • Contemporary precision synthesis, incorporating green chemistry, photocatalysis, and electrosynthesis, enables efficient bond formation with high regiocontrol under mild conditions.
  • Recent advances in palladium-catalyzed C─H activation offer improved synthetic efficiency and selectivity.
  • Radical-mediated photoredox cascade methodologies present sustainable and operationally efficient paradigms for PAH synthesis.

Conclusions:

  • The field is moving towards sustainable and efficient synthesis of triphenylenes.
  • Further research into C─H activation and photoredox catalysis holds promise for overcoming current limitations.
  • Understanding regiochemical factors and reaction mechanisms is key for developing new synthetic routes.