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Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

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Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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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Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene01:11

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The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
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Nomenclature of Alkynes02:39

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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:
18.9K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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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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Azulene-Fused Acenes.

Albert Ong1, Tao Tao1,2, Qing Jiang1

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

Angewandte Chemie (International Ed. in English)
|July 13, 2022
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel azulene-fused acene molecules with unique electronic properties and enhanced stability compared to traditional acenes. One molecule exhibited significant open-shell diradical character in its dication form.

Keywords:
AceneAromaticityAzulenePolycyclic Hydrocarbon

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Non-alternant, non-benzenoid polycyclic hydrocarbons (PHs) possess distinct electronic properties compared to their all-benzenoid counterparts.
  • Azulene-fused acenes represent a novel class of π-conjugated molecules with potentially unique characteristics.

Purpose of the Study:

  • To synthesize and characterize novel azulene-fused acene molecules (1, 2, and 3).
  • To investigate their electronic properties, stability, and aromaticity.
  • To explore the behavior of their dicationic forms, particularly diradical character.

Main Methods:

  • Synthesis of three azulene-fused acene molecules.
  • X-ray crystallographic analysis for structural determination.
  • Nuclear Magnetic Resonance (NMR) and Electron Spin Resonance (ESR) spectroscopy for electronic property analysis.
  • Theoretical calculations for electronic structure elucidation.

Main Results:

  • Successful synthesis of azulene-fused acenes (1, 2, 3), isoelectronic to pentacene, hexacene, and heptacene.
  • X-ray, NMR, and computational data indicate localized aromaticity in six- and five-membered rings, with non-aromatic seven-membered rings.
  • Molecules exhibit enhanced stability over corresponding acenes.
  • Chemical oxidation formed dications; dication of molecule 3 showed significant open-shell diradical character (30.2%).

Conclusions:

  • Azulene-fused acenes combine properties of both azulene and acenes, offering improved stability.
  • The observed diradical character in the dication of molecule 3 is attributed to the aromaticity recovery of specific structural units.
  • These findings open new avenues for designing π-conjugated systems with tunable electronic and magnetic properties.