What happens when salicylic acid is treated with (CH₂CO)₂O/H⁺?

Write chemical equations in support of your answer.

When salicylic acid is treated with acetic anhydride ((CH₂CO)₂O) in the presence of an acid catalyst (H⁺), an esterification reaction occurs. This process results in the formation of an ester known as acetylsalicylic acid, commonly recognized as aspirin.

Chemical Reaction Overview

The reaction can be summarized in the following steps:

• Salicylic acid reacts with acetic anhydride.
• The acid catalyst facilitates the reaction.
• An ester bond is formed, resulting in acetylsalicylic acid.

Chemical Equation

The balanced chemical equation for this reaction is:

C7H6O3 (salicylic acid) + (CH3CO)2O (acetic anhydride) → C9H8O4 (acetylsalicylic acid) + CH3COOH (acetic acid)

Mechanism of the Reaction

In this reaction, the hydroxyl group (-OH) of salicylic acid reacts with the acetic anhydride. The acid catalyst protonates the carbonyl oxygen of acetic anhydride, making it more electrophilic. This allows the hydroxyl group to attack, leading to the formation of the ester and the release of acetic acid as a byproduct.

Summary

In summary, treating salicylic acid with acetic anhydride and an acid catalyst results in the synthesis of acetylsalicylic acid through an esterification reaction, which is significant in pharmaceutical applications.