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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.

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.

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...

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...

Nitrosation of Enols

Nitrosation of Enols

The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.

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

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

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...

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Summary

This summary is machine-generated.

This study details the molecular structure of C(15)H(14)N(2)O(4), revealing specific dihedral angles and hydrogen bonding. Intermolecular interactions and pi-pi contacts contribute to crystal structure stabilization.

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Area of Science:

Crystallography
Molecular Chemistry
Supramolecular Chemistry

Background:

Understanding molecular interactions is crucial for predicting material properties.
Crystal engineering relies on detailed analysis of intermolecular forces.
Aromatic ring orientation and hydrogen bonding significantly influence crystal packing.

Purpose of the Study:

To elucidate the crystal structure of the title compound C(15)H(14)N(2)O(4).
To investigate the role of intra- and intermolecular hydrogen bonds in molecular conformation.
To analyze pi-pi stacking interactions and their contribution to crystal stabilization.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of bond lengths, bond angles, and dihedral angles.
Identification and quantification of hydrogen bonds and pi-pi contacts.

Main Results:

The compound C(15)H(14)N(2)O(4) exhibits a dihedral angle of 78.33(3)° between aromatic rings.
An intramolecular N-H⋯O hydrogen bond forms a non-planar six-membered ring with a flattened-boat conformation.
Intermolecular N-H⋯O hydrogen bonds and pi-pi contacts (3.841(3) Å and 3.961(3) Å) stabilize the crystal lattice.

Conclusions:

The crystal structure is stabilized by a combination of intramolecular hydrogen bonding, intermolecular hydrogen bonding, and pi-pi stacking.
The observed conformation and packing are dictated by these specific non-covalent interactions.
This detailed structural analysis provides insights into the solid-state behavior of related organic compounds.