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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.

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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.

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

Naming Acid Halides
The IUPAC and common names of acid halides are derived from the corresponding carboxylic acids, by changing “ic acid” to “yl halide.” For example, as shown below, the IUPAC name ethanoyl chloride is derived from ethanoic acid, and the common name, acetyl chloride, is obtained from acetic acid.

IUPAC Nomenclature of Aldehydes

IUPAC Nomenclature of Aldehydes

Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...

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...

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

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Published on: November 23, 2016

N'-(3,4-Dihydroxy-benzyl-idene)acetohydrazide monohydrate.

Lu-Ping Lv, Tie-Ming Yu, Wen-Bo Yu

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This study characterizes a novel Schiff base hydrate, revealing its near-planar structure and intricate intermolecular hydrogen bonding. The crystal structure forms a 2D network stabilized by hydrogen bonds and pi-pi interactions.

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Area of Science:

Crystal chemistry
Supramolecular chemistry
Organic chemistry

Background:

Schiff bases are versatile organic compounds with diverse applications.
Understanding crystal packing and intermolecular forces is crucial for material design.

Purpose of the Study:

To elucidate the crystal structure and intermolecular interactions of a specific Schiff base hydrate.
To analyze the molecular geometry and hydrogen bonding network.

Main Methods:

Single-crystal X-ray diffraction analysis.
Analysis of molecular planarity and dihedral angles.
Identification and characterization of hydrogen bonds and π-π interactions.

Main Results:

The Schiff base molecule exhibits approximate planarity with a dihedral angle of 5.40(7)° between benzene and acetohydrazide planes.
An intramolecular O-H⋯O hydrogen bond was identified.
A 2D network structure was observed, stabilized by various hydrogen bonds (O-H⋯O, N-H⋯O, O-H⋯N, C-H⋯O) and π-π interactions.

Conclusions:

The compound forms a stable 2D supramolecular network through a combination of hydrogen bonding and π-π stacking.
The detailed structural analysis provides insights into the solid-state behavior of Schiff base hydrates.