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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Overview
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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Published on: September 18, 2016

Corannulene ethers via Ullmann condensation.

Renana Gershoni-Poranne1, Doron Pappo, Ephrath Solel

  • 1Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.

Organic Letters
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

Synthesizing penta-aryloxycorannulene derivatives is now efficient using a copper-catalyzed Ullmann condensation. This method simplifies the creation of pentagonal building blocks for advanced materials and supramolecular chemistry.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Penta-aryloxycorannulene derivatives have been challenging synthetic targets.
  • Efficient synthesis methods are crucial for exploring their potential applications.

Purpose of the Study:

  • To develop an efficient synthetic route for penta-aryloxycorannulene derivatives.
  • To explore the compatibility of the reaction with various substituted phenols.
  • To enable the preparation of novel pentagonal building blocks for materials science.

Main Methods:

  • Utilized a copper(I)-catalyzed Ullmann condensation reaction.
  • Employed 1,3,5,7,9-pentachlorocorannulene and diverse substituted phenols as starting materials.
  • Conducted the reaction under air and mild conditions.

Main Results:

  • Achieved efficient synthesis of penta-aryloxycorannulene derivatives.
  • Demonstrated reaction compatibility with a broad range of substituted phenols, including 4-bromophenol.
  • Established mild and air-stable reaction conditions.

Conclusions:

  • The copper-catalyzed Ullmann condensation provides an accessible route to penta-aryloxycorannulene derivatives.
  • This method facilitates the preparation of symmetrically substituted pentagonal building blocks.
  • The findings pave the way for new materials and supramolecular architectures.