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Related Concept Videos

Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.9K
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,...
5.9K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

7.8K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
7.8K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

7.1K
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).
7.1K
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

5.0K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
5.0K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.4K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.1K
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...
4.1K

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Facile Preparation of 4-Substituted Quinazoline Derivatives
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Heterocyclic Quinodimethanes.

Xueliang Shi1, Chunyan Chi2

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

Topics in Current Chemistry (Cham)
|June 22, 2017
PubMed
Summary

This review covers heterocyclic quinodimethanes with O, N, S, and Si atoms, exploring their synthesis, properties, and applications in dyes and organic electronics. Some exhibit unique open-shell diradical character, offering insights for designing novel materials.

Keywords:
Anti-aromaticityAromaticityDiradicaloidHeterocyclicPro-aromaticityQuinodimethane

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Heterocyclic quinodimethanes are versatile organic compounds with tunable electronic properties.
  • Understanding their structure-property relationships is crucial for advanced material design.
  • Existing research highlights their potential in various technological applications.

Purpose of the Study:

  • To comprehensively review heterocyclic quinodimethanes containing O, N, S, and Si atoms.
  • To elucidate the synthesis, structural characterization, and properties of these compounds.
  • To provide insights into the rational design of quinoidal π-conjugated molecules for specific applications.

Main Methods:

  • Literature review of syntheses and characterizations.
  • Analysis of chemical and physical properties.
  • Exploration of structure-property relationships.

Main Results:

  • Detailed description of heterocyclic quinodimethanes with closed- or open-shell structures.
  • Identification of applications in dyes, pigments, and organic semiconductors.
  • Observation of open-shell singlet diradical character in some compounds, leading to unusual properties.

Conclusions:

  • Heterocyclic quinodimethanes offer a rich platform for developing advanced functional materials.
  • The presence of heteroatoms (O, N, S, Si) significantly influences their electronic and physical properties.
  • Further research into their diradical character can unlock new applications in organic electronics and beyond.