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Diazonium Group Substitution: –OH and –H

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.

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

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

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.

Structures of Carboxylic Acid Derivatives

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...

Preparation of Nitriles

Preparation of Nitriles

One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...

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(E)-N'-(2,4,5-Trifluorobenzyl-idene)isonicotinohydrazide monohydrate.

H S Naveenkumar, Amirin Sadikun, Pazilah Ibrahim

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This study details the crystal structure of a Schiff base compound, C(13)H(8)F(3)N(3)O·H(2)O. The research highlights the molecule

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Area of Science:

Crystallography
Organic Chemistry
Supramolecular Chemistry

Background:

Schiff bases are versatile organic compounds with diverse applications.
Understanding the crystal structure of Schiff base derivatives is crucial for predicting their properties and potential uses.

Purpose of the Study:

To elucidate the crystal structure and intermolecular interactions of the title Schiff base compound, C(13)H(8)F(3)N(3)O·H(2)O.
To analyze the molecular geometry, including planarity and configuration around the C=N bond.

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 to describe the molecular geometry.
Identification and analysis of intermolecular hydrogen bonding interactions.

Main Results:

The Schiff base molecule features nearly coplanar benzene and pyridine rings with a dihedral angle of 6.64(7)°.
The molecule adopts an E configuration around the C=N double bond.
Intermolecular hydrogen bonds (N-H⋯O, O-H⋯O, O-H⋯N, C-H⋯O) link molecules into 2D planes via water molecules.

Conclusions:

The crystal structure reveals specific molecular arrangements driven by hydrogen bonding.
The observed planarity and configuration influence the compound's packing in the solid state.
This structural information is valuable for designing related compounds with tailored properties.