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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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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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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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Porous Aromatic Frameworks as a Platform for Multifunctional Applications.

Ye Yuan1, Guangshan Zhu1

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Porous aromatic frameworks (PAFs) offer tunable properties for diverse applications. This review highlights recent advances in PAF design and synthesis for molecule storage, gas separation, catalysis, and ion extraction.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Porous aromatic frameworks (PAFs) are recognized for high surface areas, porosity, structural diversity, and stability.
  • Their customizable architectures are synthesized via covalent bonding using accessible building blocks.
  • PAFs feature phenyl-ring-derived fragments amenable to functional group modification through established synthetic methods.

Purpose of the Study:

  • To review recent advancements in the structural and chemical characteristics of PAFs.
  • To explore potential applications of PAFs in molecule storage, gas separation, catalysis, and ion extraction.
  • To discuss the rational construction of functional PAFs for next-generation porous materials.

Main Methods:

  • Review of literature on PAF synthesis and characterization.
  • Analysis of structure-property relationships in PAFs.
  • Exploration of established synthetic chemistry techniques for PAF functionalization.

Main Results:

  • PAFs can be designed with tailored properties through covalent synthesis.
  • Functionalization of PAFs enables diverse applications.
  • Recent progress shows significant potential in areas like gas separation and catalysis.

Conclusions:

  • PAFs represent a versatile class of porous materials with broad application potential.
  • Continued research in rational design and synthesis will drive the development of advanced PAFs.
  • Functional PAFs are key to next-generation porous materials for various technological challenges.