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Hydrolysis of Chlorobenzene to Phenol: Dow Process

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...

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The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.

Diazonium Group Substitution: –OH and –H

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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.

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

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Summary

This summary is machine-generated.

This study details the molecular structure of a specific organic compound, C(7)H(8)N(2)O(2). Its benzene ring and hydrazide group are angled at approximately 26 degrees, stabilized by hydrogen bonds.

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Area of Science:

Crystallography
Organic Chemistry
Molecular Structure

Background:

Understanding the precise three-dimensional arrangement of atoms in organic molecules is crucial for predicting their properties and reactivity.
The hydrazide functional group is a key component in various pharmaceuticals and materials.

Purpose of the Study:

To elucidate the crystal structure of the compound C(7)H(8)N(2)O(2).
To analyze the spatial relationship between the benzene ring and the hydrazide moiety.
To identify the intermolecular interactions stabilizing the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the atomic coordinates and unit cell parameters.
Analysis of bond lengths, bond angles, and torsion angles provided detailed geometric information.
Intermolecular interactions, specifically hydrogen bonds, were identified and characterized.

Main Results:

The crystal structure of C(7)H(8)N(2)O(2) was successfully determined.
A significant dihedral angle of 25.75(6)° was observed between the mean planes of the benzene ring and the hydrazide group.
The crystal packing is stabilized by a network of intermolecular N-H⋯O and O-H⋯N hydrogen bonds.

Conclusions:

The determined crystal structure provides fundamental insights into the solid-state behavior of this organic compound.
The observed molecular conformation and hydrogen bonding patterns are key factors influencing the compound's physical and chemical properties.
This structural data serves as a basis for further investigations into related compounds and their applications.