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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.7K
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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Nomenclature of Alkynes02:39

Nomenclature of Alkynes

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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
22.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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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.
13.7K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.3K
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...
4.3K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Toward Larger Cyclo-9,10-Anthryleneparaphenylenes.

Moritz P Schuldt1, Frank Rominger1, Sven M Elbert1

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 27, 2026
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Summary

Researchers synthesized novel nanohoops using a cross-coupling strategy. These diphenylanthracene-based structures, up to the nonamer, were characterized, revealing susceptibility to oxidation in their rearomatized cyclo-anthryleneparaphenylene form.

Keywords:
anthraceneendoperoxidesmacrocyclesnanohoopsoligomers

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Aromatic building blocks are crucial for constructing complex molecular architectures.
  • Nanohoops, or cyclic aromatic molecules, offer unique structural and electronic properties.
  • Developing scalable synthesis methods for well-defined nanohoops remains a challenge.

Purpose of the Study:

  • To synthesize and characterize nanohoops of varying sizes based on diphenylanthracene units.
  • To investigate the three-dimensional structures of these synthesized nanohoops.
  • To study the reactivity and stability of the nanohoops, particularly their susceptibility to oxidation.

Main Methods:

  • Utilizing a cross-coupling strategy involving an anthracene-based kinked precursor and 9,10-diborylated anthracene.
  • Synthesizing and isolating nanohoops up to the nonameric stage.
  • Employing X-ray diffraction for three-dimensional structural elucidation.
  • Conducting reactivity studies, focusing on oxidation resistance.

Main Results:

  • Successful synthesis and isolation of diphenylanthracene-based nanohoops up to the nonamer (36 aromatic rings).
  • Detailed three-dimensional structural information obtained via X-ray diffraction.
  • The trimeric macrocycle, upon rearomatization to cyclo-9,10-anthryleneparaphenylene (CAPP), demonstrated significant susceptibility to oxidation.

Conclusions:

  • The cross-coupling strategy provides a viable route to synthesize well-defined, multi-ring aromatic nanohoops.
  • Structural characterization confirms the precise arrangement of aromatic units in the nanohoops.
  • The inherent instability of the rearomatized CAPP form towards oxidation highlights limitations for certain applications and suggests areas for future molecular design improvements.