Reactants:
* Benzoyl chloride (C₆H₅COCl): A reactive acyl chloride.
* Aniline (C₆H₅NH₂): An aromatic amine.
Products:
* Benzanilide (C₆H₅CONHC₆H₅): An amide formed by the reaction.
* Hydrogen chloride (HCl): A byproduct of the reaction.
Reaction Mechanism:
1. Nucleophilic Attack: The lone pair of electrons on the nitrogen atom of aniline attacks the electrophilic carbonyl carbon of benzoyl chloride. This forms a tetrahedral intermediate.
2. Proton Transfer: A proton from the nitrogen is transferred to the chlorine atom, generating a chloride ion.
3. Elimination: The chloride ion leaves, and the nitrogen re-forms its double bond with the carbonyl carbon, leading to the formation of the amide, benzanilide.
Reaction Equation:
```
C₆H₅COCl + C₆H₅NH₂ → C₆H₅CONHC₆H₅ + HCl
```
Key Points:
* The reaction requires a base to neutralize the HCl produced. Common bases used include pyridine or triethylamine.
* The reaction is usually carried out in an aprotic solvent, such as dichloromethane or toluene.
* Benzanilide is a crystalline solid with a melting point of 163°C.
Applications:
* This reaction is used to synthesize various amides, which have applications in pharmaceuticals, dyes, and polymers.
* The reaction is also used in the preparation of peptide bonds, the fundamental linkage in proteins.
