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Aromatic Hydrocarbon Cations: Structural Overview

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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.
Removing one hydrogen from the intervening CH2 group...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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When a carbonyl compound is treated with a strong base, the α position gets deprotonated to give a resonance-stabilized intermediate called an enolate. Enolates are ambident nucleophiles because they possess two nucleophilic sites that can attack an electrophile owing to the delocalization of the negative charge between the α carbon and oxygen atoms. When the oxygen atom attacks an electrophile, it is called O-attack, whereas electrophilic attack via the α carbon is known as...
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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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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A pyridine-N-oxide catenane for cation recognition.

Sean R Barlow1, Nathan R Halcovitch1, Nicholas H Evans1

  • 1Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK. n.h.evans@lancaster.ac.uk.

Organic & Biomolecular Chemistry
|March 25, 2024
PubMed
Summary
This summary is machine-generated.

Researchers rapidly synthesized a novel pyridine-N-oxide [2]catenane. This molecule shows potential for reversible protonation and selective lithium cation binding, offering new avenues in supramolecular chemistry.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Catenanes are mechanically interlocked molecular architectures with unique properties.
  • Pyridine-N-oxide moieties can act as coordinating sites and hydrogen bond acceptors.
  • Developing efficient synthetic routes to complex interlocked molecules remains a challenge.

Purpose of the Study:

  • To describe a rapid method for synthesizing a pyridine-N-oxide containing [2]catenane.
  • To characterize the synthesized [2]catenane using advanced analytical techniques.
  • To investigate the host-guest properties of the [2]catenane, specifically its cation binding and protonation behavior.

Main Methods:

  • Rapid synthesis of the pyridine-N-oxide [2]catenane.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and mass spectrometry.
  • X-ray single crystal structure determination for precise structural analysis.
  • Proton (1H) NMR titration experiments to study cation binding and protonation.

Main Results:

  • Successful and rapid preparation of the target pyridine-N-oxide [2]catenane.
  • Full structural and compositional confirmation via NMR, mass spectrometry, and X-ray crystallography.
  • 1H NMR titration data indicated reversible protonation of the [2]catenane.
  • The [2]catenane demonstrated preferential binding of lithium cations over sodium cations.

Conclusions:

  • A facile synthetic route to a functionalized [2]catenane has been established.
  • The pyridine-N-oxide [2]catenane exhibits interesting supramolecular properties, including pH-responsiveness and selective ion recognition.
  • This work provides a foundation for designing advanced molecular machines and sensors based on catenane architectures.