Cyclodextrins containing an acetone bridge. Synthesis and study as epoxidation catalysts

Area of Science:

• Organic Chemistry
• Catalysis
• Supramolecular Chemistry

Background:

• Cyclodextrins are cyclic oligosaccharides with unique host-guest properties.
• Modified cyclodextrins can serve as catalysts in various organic transformations.
• Epoxidation is a crucial reaction in organic synthesis for introducing oxygen-containing functional groups.

Purpose of the Study:

• To synthesize novel cyclodextrin derivatives.
• To investigate the catalytic activity of these derivatives in alkene epoxidation.
• To compare their catalytic performance with simple ketones and study reaction inhibition.

Main Methods:

• Synthesis of three cyclodextrin derivatives (1, 2, and 3) involving selective debenzylation, alkylation, dihydroxylation, periodate cleavage, and deprotection.
• Catalytic epoxidation of alkenes using synthesized cyclodextrin derivatives and oxone as the oxidant.
• Comparative study with ketone-catalyzed epoxidation and investigation of reaction inhibition.

Main Results:

• Successful synthesis of three distinct cyclodextrin derivatives.
• All three derivatives exhibited catalytic activity in the epoxidation of various alkenes in the presence of oxone.
• Comparative analysis provided insights into the efficiency and selectivity of these cyclodextrin-based catalysts.

Conclusions:

• The synthesized cyclodextrin derivatives are effective catalysts for alkene epoxidation.
• These modified cyclodextrins offer a promising alternative to traditional epoxidation catalysts.
• Further studies on inhibition mechanisms can optimize their application in organic synthesis.