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Nucleophilic Aromatic Substitution: Elimination–Addition

Nucleophilic Aromatic Substitution: Elimination–Addition

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 confirmed through isotopic...

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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.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...

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...

Carbocations

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

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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.
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 the...

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 para position.

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4-Phenyl-semicarbazide.

Uzma Ashiq, Rifat Ara Jamal, Muhammad Nadeem Arshad

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

This study details the crystal structure of a compound, C(7)H(9)N(3)O. Its molecular arrangement is stabilized by multiple hydrogen bonds, including both intermolecular and intramolecular interactions.

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Area of Science:

Crystallography
Chemical Physics
Molecular Structure

Background:

Understanding the precise arrangement of atoms in a compound is crucial for predicting its properties.
Hydrogen bonding plays a significant role in molecular assembly and material characteristics.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(7)H(9)N(3)O.
To identify and characterize the intermolecular and intramolecular interactions stabilizing the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the molecular and crystal structure.
Analysis of the resulting crystallographic data to identify hydrogen bonding and other non-covalent interactions.

Main Results:

The title compound, C(7)H(9)N(3)O, crystallizes with two independent molecules in the asymmetric unit.
Four distinct intermolecular N-H⋯O hydrogen bonds were identified, contributing to the crystal structure's stability.
Four intramolecular interactions, including N-H⋯N and C-H⋯O types, were also observed within the molecules.

Conclusions:

The crystal structure of C(7)H(9)N(3)O has been successfully determined.
The observed hydrogen bonding network provides insights into the compound's solid-state behavior and intermolecular forces.
Intramolecular interactions further define the specific conformation of the molecules in the crystal lattice.