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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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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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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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Polyphosphorylated triphenylenes: synthesis, crystal structure, and selective catechol recognition.

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New Discopus receptors efficiently bind dihydroxybenzenes, forming selective 1:2 complexes. These multivalent hydrogen bond acceptors show strong binding affinities for catechol derivatives, outperforming existing receptors.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Development of novel molecular receptors is crucial for selective guest binding.
  • Triphenylene-based scaffolds offer unique structural properties for host-guest chemistry.

Purpose of the Study:

  • To synthesize and characterize new multivalent hydrogen bond acceptors, Discopus 1a,b.
  • To investigate the molecular recognition properties of Discopus receptors towards dihydroxybenzenes.

Main Methods:

  • Efficient synthesis of Discopus receptors.
  • X-ray crystallography for structural analysis.
  • NMR spectroscopy, microcalorimetry, and infrared spectroscopy for binding studies.
  • Molecular dynamics simulations for mechanistic insights.

Main Results:

  • Discopus 1a,b were synthesized in high yield, featuring a triphenylene core with six (diaryl)phosphinate groups.
  • X-ray structure revealed cooperative hydrogen bonds and CH-pi interactions.
  • Selective complexation with catechol derivatives in a 1:2 host:guest stoichiometry was observed.
  • High association constants (30-2837 M⁻¹) indicate strong binding, exceeding those of known receptors.

Conclusions:

  • Discopus receptors demonstrate efficient and selective binding of catechol derivatives.
  • The multivalent nature and unique structure of Discopus enable strong host-guest interactions.
  • Potential for advanced applications in molecular recognition and sensing.