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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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...
3.4K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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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...
1.9K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

1.9K
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.
1.9K
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

7.3K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
7.3K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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

5.0K
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...
5.0K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

2.8K
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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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Functionalizing pillar[n]arenes.

Nathan L Strutt1, Huacheng Zhang, Severin T Schneebeli

  • 1Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60201-3113, United States.

Accounts of Chemical Research
|July 8, 2014
PubMed
Summary
This summary is machine-generated.

Pillar[n]arenes are a versatile class of macrocycles with tunable properties for host-guest chemistry. Their facile synthesis and diverse functionalization routes enable applications in nanotechnology, materials science, and medicine.

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Area of Science:

  • Macrocyclic chemistry
  • Supramolecular chemistry
  • Host-guest science

Background:

  • Traditional macrocycles like cyclodextrins and calixarenes have dominated host-guest science.
  • Pillar[n]arenes represent a newer, increasingly important class of macrocycles with a unique pillar-like structure.

Purpose of the Study:

  • To review the synthetic routes for chemically modified pillar[n]arenes.
  • To explore the diverse functionalization strategies and their impact on properties.
  • To survey the potential applications of functionalized pillar[n]arenes in various scientific fields.

Main Methods:

  • Detailed discussion of pillar[n]arene functionalization chemistry, including monofunctionalization, difunctionalization, rim differentiation, perfunctionalization, and phenylene substitution.
  • Assessment of synthetic challenges and opportunities in selective chemical modification.
  • Examination of related macrocyclic compounds and their future prospects.

Main Results:

  • Pillar[n]arenes possess rigid, π-electron-rich cavities suitable for binding electron-deficient guests.
  • Their unique structure allows for diverse and facile chemical modifications, creating tailored hosts.
  • Functionalized pillar[n]arenes show promise in nanotechnology, materials science, and medicine.

Conclusions:

  • Pillar[n]arenes offer significant advantages over other macrocycles due to their versatile functionalization.
  • Further development of selective modification methods is crucial for realizing their full potential.
  • Functionalized pillar[n]arenes are poised to find broad applications in advanced scientific fields.