What Are Imine and Enamine Formation Reactions?

TL;DR

Imine formation occurs when a ketone reacts with a primary amine, resulting in the elimination of water. Enamines are formed by reacting a ketone with a secondary amine, placing the double bond on the more substituted side for stability. Both imines and enamines can be reduced to amines through reductive amination using sodium cyanoborohydride.

Transcript

in this video we're going to go over the formation of an enamine and an enemy so let's start with a ketone if we react a ketone with let's say a primary amine it's going to give us the immune product and to draw it all you need to do is remove water so if you take out h2o and then connect the remaining parts you're going to get an amine which looks... Read More

Key Insights

• 💁 Ketones react with primary amines to form imines and with secondary amines to form enamines.
• ⏫ The double bond in an enamine is preferred to be on the more substituted side for stability.
• ❓ Reductive amination using sodium cyanoborohydride can convert imine into amine.
• ❓ Enamines can also be reduced into tertiary amines using the same reductive amination process.
• 👊 The formation of imines and enamines involves protonation and nucleophilic attack.
• 😥 Preferred reaction conditions for imine formation are mildly acidic, around pH 4 to 5.
• 💁 Ammonia or other weak bases can be used in the imine formation mechanism.

Summary & Key Takeaways

• A ketone reacts with a primary amine to form an imine by removing water.

• Reacting a ketone with a secondary amine gives an enamine, with the double bond on the more substituted side.

• Imine can be reduced into an amine through reductive amination using sodium cyanoborohydride.

• Enamines can also be reduced into tertiary amines using the same reductive amination process.