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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 Secondary and Tertiary Amines

Nomenclature of Secondary and Tertiary Amines

The secondary and tertiary amines are derivatives of ammonia, where two and three of its hydrogens are replaced by alkyl groups, respectively. Secondary and tertiary amines can be symmetrical with identical alkyl groups attached to the nitrogen atom or unsymmetrical when more than one type of alkyl group is present. The standard nomenclature of secondary and tertiary amines is similar to the names given to the primary amines. They are generally named alkylamines. As depicted in Figure 1, for...

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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Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

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N,N'-Bis(pyrimidin-2-yl)terephthalamide dihydrate.

Suchada Chantrapromma, Hoong-Kun Fun, Subrata Jana

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This study details the crystal structure of an organic molecule, C(16)H(12)N(6)O(2)·2H(2)O. It reveals a unique two-dimensional network formed by hydrogen bonds, extended into a three-dimensional structure with water molecules.

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Area of Science:

Crystallography
Organic Chemistry
Supramolecular Chemistry

Background:

Understanding the three-dimensional arrangement of organic molecules is crucial for designing new materials.
Hydrogen bonding and intermolecular interactions dictate crystal packing and material properties.

Purpose of the Study:

To elucidate the crystal structure and intermolecular interactions of the title compound, C(16)H(12)N(6)O(2)·2H(2)O.
To analyze the network formation through hydrogen bonding and C-H···π interactions.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of hydrogen bonding (N-H⋯N, C-H⋯N, O-H⋯O, C-H⋯O) and C-H⋯π interactions was performed.

Main Results:

The organic molecule C(16)H(12)N(6)O(2)·2H(2)O crystallizes with the molecule lying across a crystallographic inversion center.
A two-dimensional network is formed via N-H⋯N and C-H⋯N hydrogen bonds, extended to a three-dimensional network by water molecules through O-H⋯O and C-H⋯O bonds.
A C-H⋯π interaction involving the benzene ring was identified.

Conclusions:

The crystal structure analysis provides insights into the packing of the organic molecule and its hydration.
The identified hydrogen bonds and C-H⋯π interaction are key to the formation of the extended 2D and 3D networks.
This structural information is valuable for understanding structure-property relationships in related organic compounds.