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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.

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

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

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Published on: April 27, 2017

Guanidinium 2-phenyl-acetate.

Graham Smith, Urs D Wermuth

Acta Crystallographica. Section E, Structure Reports Online

|May 19, 2011

Summary

This study reveals guanidinium cations forming hydrogen bonds with phenyl-acetate anions, creating one-dimensional columnar structures. These unique crystal structures contain significant solvent-accessible voids.

Area of Science:

Crystal engineering
Supramolecular chemistry
Materials science

Background:

Guanidinium salts are known for their ability to form extensive hydrogen bond networks.
Phenyl-acetate anions offer potential sites for molecular recognition and self-assembly.
Understanding crystal structures informs the design of novel materials.

Purpose of the Study:

To elucidate the crystal structure of a guanidinium phenyl-acetate salt.
To investigate the hydrogen bonding interactions and resulting supramolecular architecture.
To characterize the presence and volume of voids within the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the molecular structure.
Hydrogen bond analysis was performed to identify and quantify interactions.

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Volumetric analysis of solvent-accessible voids was calculated.

Main Results:

The crystal structure of guanidinium phenyl-acetate was successfully determined.
Guanidinium cations engage in three distinct cyclic hydrogen bonds with phenyl-acetate anions (one R(2)(2)(8) and two R(2)(1)(6) motifs).
These interactions lead to the formation of one-dimensional columnar structures along the 4(2) axis, with solvent-accessible voids of 86.5 Å³.

Conclusions:

The study demonstrates a specific hydrogen bonding pattern in guanidinium phenyl-acetate leading to 1D columnar assembly.
The identified voids suggest potential for guest molecule inclusion or further structural modification.
This work contributes to the understanding of crystal engineering principles for designing functional supramolecular materials.