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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Preparation of Alkynes: Dehydrohalogenation02:34

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Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

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Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...
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α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview01:19

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The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
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Preparation of Epoxides03:00

Preparation of Epoxides

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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
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Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparative-scale synthesis of nonacene.

Andrej Jančařík1,2,3, Jan Holec4, Yuuya Nagata5

  • 1GNS Group, CEMES-CNRS, 29 Rue J. Marvig, 31055, Toulouse, France. andrej.jancarik@u-bordeaux.fr.

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Researchers synthesized nonacene, a large polycyclic aromatic hydrocarbon, overcoming challenges in producing these molecules in bulk. This breakthrough offers a stable form of nonacene, paving the way for further research and applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Significant advancements in synthesizing polycyclic aromatic hydrocarbons (PAHs) like acenes have been achieved using on-surface methods and low-temperature solid matrices.
  • Current methods yield only minute quantities of acenes, hindering large-scale production and broader applications.
  • Despite decades of effort, the bulk synthesis of higher acene homologues, such as heptacene, remains a significant hurdle.

Purpose of the Study:

  • To report the successful preparation and characterization of nonacene.
  • To demonstrate the thermal and temporal stability of the synthesized nonacene.
  • To address the challenge of large-scale synthesis for higher acene homologues.

Main Methods:

  • On-surface synthesis techniques in ultra-high vacuum environments.
  • Generation of acenes within solid matrices at low temperatures.
  • Characterization of nonacene through advanced analytical methods.

Main Results:

  • Successful synthesis and characterization of nonacene.
  • Demonstration of excellent thermal stability of nonacene.
  • Confirmation of in-time stability for nonacene.

Conclusions:

  • The developed method enables the preparation of nonacene, a significant advancement in PAH synthesis.
  • Nonacene exhibits remarkable stability, suggesting potential for practical applications.
  • This work overcomes previous limitations in producing higher acene homologues in substantial quantities.