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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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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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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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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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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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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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An imidazolium-functionalized self-assembling calix[4]pyrrole.

Abdullah Aydogan1, Jonathan L Sessler

  • 1Department of Chemistry, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey.

Chemical Communications (Cambridge, England)
|September 24, 2014
PubMed
Summary
This summary is machine-generated.

Researchers created a novel calixpyrrole molecule with an imidazolium group. This molecule self-assembles into supramolecular polymers, with both ions binding to the calixpyrrole structure.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Calixpyrroles are macrocyclic compounds known for their ability to form host-guest complexes.
  • Imidazolium salts are versatile building blocks in supramolecular chemistry and ionic liquids.
  • Self-assembly is a key process for creating ordered structures from molecular components.

Purpose of the Study:

  • To synthesize a novel calixpyrrole derivative functionalized with an imidazolium group.
  • To investigate the self-assembly behavior of this new compound.
  • To characterize the resulting supramolecular structures.

Main Methods:

  • Synthesis of a calixpyrrole bearing a tethered imidazolium functional group.
  • Preparation of the bromide salt of the synthesized compound.
  • Analysis of self-assembly through appropriate spectroscopic and microscopic techniques.

Main Results:

  • Successful synthesis of the target calixpyrrole-imidazolium bromide salt.
  • Observation of spontaneous self-assembly into supramolecular polymers.
  • Demonstration that both the bromide anion and the imidazolium cation are integrated into the calixpyrrole core during self-assembly.

Conclusions:

  • The designed calixpyrrole derivative effectively self-assembles into ordered supramolecular polymers.
  • The self-assembly process involves the specific binding of both the anion and cation to the calixpyrrole framework.
  • This work presents a new strategy for constructing functional supramolecular materials using calixpyrrole scaffolds.