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Electrophilic Aromatic Substitution: Nitration of Benzene

Electrophilic Aromatic Substitution: Nitration of Benzene

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.

NMR Spectroscopy of Benzene Derivatives

NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...

meta-Directing Deactivators: –NO2, –CN, –CHO, –&NoBreak;CO2R, –COR, –CO2H

meta-Directing Deactivators: –NO₂, –CN, –CHO, –⁠CO₂R, –COR, –CO₂H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...

2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

Nomenclature of Aromatic Compounds with Multiple Substituents

Nomenclature of Aromatic Compounds with Multiple Substituents

When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

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4-Methyl-3-nitro-benzonitrile.

Li-Jing Cui¹, Jing Dai

¹Ordered Matter Science Research Center, College of Chemistry and Chemical, Engineering, Southeast University, Nanjing 210096, People's Republic of China .

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This summary is machine-generated.

This study details the crystal structure of C(8)H(6)N(2)O(2), revealing a nitro group rotation of 23.2 degrees. Van der Waals interactions are key to stabilizing the compound

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Area of Science:

Crystallography
Organic Chemistry
Solid-State Chemistry

Background:

Understanding molecular structure and intermolecular forces is crucial in solid-state chemistry.
The nitro group's position relative to aromatic rings influences molecular properties and reactivity.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(8)H(6)N(2)O(2).
To quantify the degree of nitro group rotation out of the benzene ring plane.
To identify the primary intermolecular interactions stabilizing the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the three-dimensional atomic arrangement.
Crystallographic data were analyzed to measure bond lengths, bond angles, and torsional angles.

Main Results:

The crystal structure of C(8)H(6)N(2)O(2) was successfully determined.
A significant nitro group rotation of 23.2(3)° out of the benzene ring plane was observed.
Van der Waals interactions were identified as the dominant forces responsible for crystal structure stabilization.

Conclusions:

The non-planar conformation of the nitro group in C(8)H(6)N(2)O(2) impacts its solid-state packing.
The study highlights the role of van der Waals forces in dictating crystal architecture for organic molecules.