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Aldehydes and Ketones with Amines: Imine Formation Mechanism

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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
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Updated: Jun 17, 2026

Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro

Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro

Published on: April 8, 2020

Imine bond protection by supramolecular encapsulation.

Kejia Shi¹, Bradley D Smith¹

¹Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, USA. smith.115@nd.edu.

Organic & Biomolecular Chemistry

|June 16, 2026

Summary

Researchers developed supramolecular strategies to stabilize imine bonds, crucial in chemistry and materials science. These methods protect imines from hydrolysis by encapsulating them within host molecules, mimicking nature's approach.

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Area of Science:

Chemistry
Biochemistry
Materials Science
Supramolecular Chemistry

Background:

Imine bonds (Schiff bases) are vital but prone to hydrolysis in water.
Nature protects imines via encapsulation in hydrophobic protein pockets.
Stabilizing imines is key for various applications.

Purpose of the Study:

To review synthetic supramolecular strategies for stabilizing imine bonds.
To explore biomimetic approaches for imine protection.
To highlight advances in preventing imine hydrolysis.

Main Methods:

Utilizing self-inclusion host systems like cavitands and pillar[5]arenes.
Employing water-soluble host molecules such as metallocages and cucurbit[7]urils.
Developing self-assembled capsules to sequester reactants and promote imine formation.

Main Results:

Supramolecular hosts effectively stabilize imine bonds against hydrolysis.
Encapsulation within hydrophobic cavities protects imines.
Displacement of imines from hosts triggers hydrolysis.

Conclusions:

Supramolecular chemistry offers robust methods for imine stabilization.
These strategies provide biomimetic protection against hydrolysis.
Potential applications include prodrug delivery, responsive materials, and catalysis.