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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.

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...

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.

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.

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

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N'-[1-(4-Nitro-phen-yl)ethyl-idene]acetohydrazide.

Yu-Feng Li, Lian-Cai Du, Fang-Fang Jian

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

This study details the synthesis of a novel compound, C(10)H(11)N(3)O(3), through a specific chemical reaction. The research reveals the compound

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Area of Science:

Organic Chemistry
Crystallography

Background:

The synthesis of novel organic compounds is crucial for developing new materials and pharmaceuticals.
Understanding molecular structure and intermolecular interactions is fundamental in chemistry.

Purpose of the Study:

To synthesize and characterize a new chemical entity, C(10)H(11)N(3)O(3).
To investigate the crystal structure and hydrogen bonding patterns of the synthesized compound.

Main Methods:

Chemical synthesis involving the reaction of acetohydrazide and 1-(4-nitro-phenyl)ethanone.
X-ray crystallography to determine the asymmetric unit and molecular arrangement.

Main Results:

Successful synthesis of the title compound C(10)H(11)N(3)O(3).
The crystal structure revealed two independent molecules in the asymmetric unit.
Inversion-related molecules form dimers stabilized by two N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring.

Conclusions:

The study successfully synthesized and structurally characterized a new compound.
The formation of dimers through specific hydrogen bonding interactions was elucidated.
This structural information contributes to the understanding of molecular assembly in organic solids.