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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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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...

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.

Electrophilic Aromatic Substitution: Nitration of Benzene

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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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Published on: January 19, 2016

N'-(2-Hydroxy-naphthyl-idene)-4-methoxy-benzo-hydrazide.

Chun-Bao Tang¹

¹Department of Chemistry, Jiaying University, Meizhou 514015, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

A novel Schiff base compound was synthesized and characterized. Its crystal structure reveals specific molecular arrangements and hydrogen bonding, offering insights into its chemical properties.

Area of Science:

Organic Chemistry
Crystallography

Background:

Schiff bases are versatile organic compounds with diverse applications.
Understanding the structural properties of Schiff bases is crucial for their development.

Purpose of the Study:

To synthesize a new Schiff base compound.
To elucidate the crystal structure and intermolecular interactions of the synthesized compound.

Main Methods:

Condensation reaction between 2-hydroxy-1-naphthyl-aldehyde and 4-methoxy-benzohydrazide.
Single crystal X-ray diffraction analysis to determine the crystal structure.

Main Results:

The Schiff base compound C(19)H(16)N(2)O(3) was successfully synthesized.
The crystal structure analysis revealed a dihedral angle of 6.8(2)° between the aromatic rings.

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Intermolecular N-H⋯O hydrogen bonds were observed, forming chains along the c axis.

Conclusions:

The synthesis and structural characterization of the Schiff base were achieved.
The observed hydrogen bonding pattern influences the compound's solid-state structure.
This study provides fundamental structural data for the Schiff base compound.