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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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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.
Due to the absence of continuous...
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
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Frost Circles for Different Conjugated Systems01:18

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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Polyaromatic Calixarene Hosts: Calix[4]pyrenes.

Michal Farber1, Varun Rawat1, Yael Diskin-Posner2

  • 1School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Science, Tel Aviv University, Tel Aviv 69978, Israel.

Organic Letters
|June 27, 2024
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Summary
This summary is machine-generated.

Calixpyrenes, a novel class of calix[4]arenes with pyrene units, show enhanced binding for organic cations. A specific calix dipyrene derivative exhibits superior cation binding compared to parent compounds.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Calix[4]arenes are well-established macrocyclic hosts.
  • Incorporating aromatic moieties into the cavity can modify host properties.

Purpose of the Study:

  • To synthesize and characterize novel calixpyrenes.
  • To investigate the effect of pyrene moieties on cation binding within calix[4]arene hosts.

Main Methods:

  • Synthesis of calixpyrenes and their derivatives.
  • Characterization using spectroscopic and analytical techniques.
  • Binding studies with organic cations, specifically N-methylpyridinium.

Main Results:

  • Successful preparation and full characterization of calixpyrenes.
  • A distally di-O-propoxy diether of calix dipyrene adopted a pinched cone conformation.
  • This derivative showed significantly enhanced binding of N-methylpyridinium compared to parent calix[4]arenes.

Conclusions:

  • Calixpyrenes represent a promising scaffold for host-guest chemistry.
  • The pyrene moieties enhance the binding affinity for organic cations.
  • Conformational control in calixpyrenes can be leveraged to optimize host-guest interactions.