Ester Hydrolysis Reaction Mechanism - Acid Catalyzed & Base Promoted Organic Chemistry

TL;DR

This video explains the mechanism of ester hydrolysis under both acid and base catalyzed conditions.

Transcript

in this video we're going to focus on the ester hydrolysis mechanism we're going to go over the acid catalyzed version and the base catalyzed version so let's begin let's say if we have methyl acetate as the ester what's going to happen if we react it with water and hdl what products will be produced in this reaction if you add water to it under ac... Read More

Key Insights

• ⚾ Ester hydrolysis can occur under both acid and base catalyzed conditions.
• 💦 In acid catalyzed ester hydrolysis, water acts as a nucleophile and the reaction is reversible.
• 😑 In base catalyzed ester hydrolysis, hydroxide ion acts as a nucleophile and the reaction is irreversible.

Questions & Answers

Q: How does the acid catalyzed version of ester hydrolysis occur?

In the acid catalyzed version, water acts as a nucleophile and protonates the ester. This leads to the formation of a tetrahedral intermediate, which undergoes further reactions to form a carboxylic acid and methanol.

Q: Why is the acid catalyzed ester hydrolysis reaction reversible?

The acid catalyzed ester hydrolysis reaction is reversible because the formation of the tetrahedral intermediate allows for the possibility of the reverse reaction, where the carboxylic acid can react with water to regenerate the ester.

Q: How does the base catalyzed version of ester hydrolysis occur?

In the base catalyzed version, hydroxide ion acts as a nucleophile and attacks the ester, forming a tetrahedral intermediate. This leads to the formation of a carboxylic acid and methanol.

Q: Why is the base catalyzed ester hydrolysis reaction irreversible?

The base catalyzed ester hydrolysis reaction is irreversible because once methoxide ion is formed, it can deprotonate the carboxylic acid. This removes the possibility of the reverse reaction and makes the reaction proceed in one direction.

Summary & Key Takeaways

• The video discusses the acid catalyzed version of ester hydrolysis, where methyl acetate reacts with water and hydrochloric acid to form a carboxylic acid and methanol.

• The base catalyzed version is also explained, where methyl acetate reacts with sodium hydroxide to form a protonated carboxylic acid and methanol.