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Related Concept Videos

Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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.
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

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

Diazonium Group Substitution: –OH and –H

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.
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

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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Related Experiment Video

Updated: May 25, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
08:43

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

Published on: January 19, 2016

Ethyl 2-(3,5-dinitro-benzamido)-benzoate.

Sohail Saeed, Naghmana Rashid, Rizwan Hussain

    Acta Crystallographica. Section E, Structure Reports Online
    |January 20, 2012
    PubMed
    Summary

    This study details the crystal structure of a C16H13N3O7 molecule, revealing a twisted conformation and intermolecular hydrogen bonding. These interactions influence the molecule

    Area of Science:

    • Crystallography
    • Molecular structure analysis
    • Organic chemistry

    Background:

    • Understanding molecular conformation is crucial for predicting chemical properties.
    • Intermolecular forces, such as hydrogen bonds, dictate crystal packing and material characteristics.

    Purpose of the Study:

    • To elucidate the three-dimensional structure of the title molecule, C16H13N3O7.
    • To investigate the presence and nature of intramolecular and intermolecular interactions within the crystal lattice.

    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 provided insights into the molecular geometry.
    • Hydrogen bond analysis identified specific N-H⋯O and C-H⋯O interactions.

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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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    Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

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    Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
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    Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

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    Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
    19:58

    Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

    Published on: July 30, 2017

    Main Results:

    • The title molecule exhibits a twisted conformation with a dihedral angle of 17.4° between its benzene rings.
    • An intramolecular N-H⋯O hydrogen bond was identified within the molecule.
    • Weak C-H⋯O hydrogen bonds were observed, leading to the formation of molecular chains along the b axis in the crystal.

    Conclusions:

    • The crystal structure of C16H13N3O7 is characterized by a non-planar molecular geometry.
    • Intramolecular hydrogen bonding contributes to the molecule's conformation.
    • Intermolecular C-H⋯O interactions play a significant role in the crystal packing, forming extended chain structures.