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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.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

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.

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...

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.

Structure and Nomenclature of Epoxides

Structure and Nomenclature of Epoxides

Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...

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Summary

This summary is machine-generated.

This study details the crystal structure of C(15)H(14)N(4)O(5), revealing two independent molecules with distinct conformations. Molecular interactions and crystal packing were analyzed, including pi-pi stacking and hydrogen bonds.

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Area of Science:

Crystallography
Chemical Physics
Materials Science

Background:

Understanding molecular conformation and crystal packing is crucial for predicting material properties.
The title compound, C(15)H(14)N(4)O(5), presents an interesting case for structural analysis due to its functional groups.

Purpose of the Study:

To elucidate the crystal structure of C(15)H(14)N(4)O(5).
To analyze the conformations of independent molecules within the asymmetric unit.
To investigate intermolecular interactions and crystal packing in the solid state.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
Analysis of bond lengths, bond angles, and dihedral angles provided conformational insights.
Identification of hydrogen bonds and π-π stacking interactions characterized the crystal packing.

Main Results:

Two crystallographically independent molecules of C(15)H(14)N(4)O(5) were identified, exhibiting different methoxy group conformations.
Both molecules displayed slight twisting between benzene rings (dihedral angles of 8.37(18)° and 7.31(18)°).
Intramolecular hydrogen bonds formed S(6) ring motifs, while weak C-H⋯O interactions and π-π stacking (3.651(2) and 3.721(2) Å centroid-centroid distances) governed crystal packing.
The crystal was identified as a non-merohedral twin with a 20.1(3)% minor component.

Conclusions:

The study provides a detailed structural characterization of C(15)H(14)N(4)O(5) at the molecular and crystal level.
The observed conformational differences and intermolecular interactions offer insights into the compound's solid-state behavior.
The presence of a non-merohedral twin highlights the complexity in crystallographic analysis.