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Related Concept Videos

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

3.7K
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.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
3.7K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.2K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.2K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.6K
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...
2.6K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

4.3K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.3K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.0K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Updated: Jun 3, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Nanospace Engineering for C8 Aromatic Isomer Separation.

Nengxiu Zhu1, Jiayi Wu1, Dan Zhao1

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585 Singapore.

ACS Nano
|January 6, 2025
PubMed
Summary
This summary is machine-generated.

Nanospace engineering enhances porous materials for efficient C8 aromatic isomer separation, offering a sustainable alternative to energy-intensive methods like distillation. This approach optimizes materials for separating para-xylene, meta-xylene, ortho-xylene, and ethylbenzene.

Keywords:
C8 aromatic isomer separationcovalent organic frameworksdesorption processesmetal−organic frameworksnanospace engineeringporous materialsselective adsorptionzeolites

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • C8 aromatic isomers (para-xylene, meta-xylene, ortho-xylene, ethylbenzene) are vital industrial chemicals.
  • Current separation methods like distillation are energy-intensive.
  • Selective adsorption using engineered porous materials presents an efficient alternative.

Purpose of the Study:

  • To review the application of nanospace engineering in porous materials for C8 aromatic isomer separation.
  • To explore how tailoring nanoscale properties enhances separation efficiency.
  • To summarize factors influencing separation performance and future opportunities.

Main Methods:

  • Review of nanospace engineering strategies applied to zeolites, MOFs, COFs, and other porous materials.
  • Analysis of how pore structure modification impacts adsorption selectivity.
  • Examination of separation techniques, thermodynamics, and desorption processes.

Main Results:

  • Nanospace engineering enables precise control over pore size, shape, and surface chemistry of porous materials.
  • Tailored materials demonstrate improved selective adsorption of C8 aromatic isomers.
  • Understanding thermodynamic and kinetic factors is crucial for optimizing separation.

Conclusions:

  • Nanospace engineering is a powerful strategy for developing advanced materials for efficient C8 aromatic isomer separation.
  • This approach offers a more sustainable and energy-efficient alternative to traditional separation techniques.
  • Further research into novel materials and process optimization holds significant potential for industrial application.