Catalysts Confined in Programmed Framework Pores Enable New Transformations and Tune Reaction Efficiency and...

Area of Science:

• Materials Science
• Catalysis
• Organic Chemistry

Background:

• Controlling chemical reactions with porous heterogeneous catalysts is challenging due to difficulties in creating uniform and precisely tunable active sites.
• Enzyme-like catalytic pockets can improve reaction efficiency and selectivity through complementary interactions with reactants.

Purpose of the Study:

• To develop a new family of catalysts based on metal-organic frameworks (MOFs) with precisely controlled catalytic microenvironments.
• To investigate the impact of functional group modification on catalytic activity and selectivity.

Main Methods:

• Synthesized an isoreticular family of catalysts using the multicomponent metal-organic framework MUF-77.
• Programmed the catalytic microenvironment by introducing functional groups (modulators) to organic linkers remote from the catalytic unit.

Main Results:

• Achieved simultaneous enhancement of reactivity and stereochemical selectivity in aldol reactions.
• Catalyzed Henry reactions, which are not feasible with homogeneous analogs.
• Demonstrated discrimination between competing reaction pathways (Henry versus aldol) for a common substrate.

Conclusions:

• Functionalizing MOFs remotely from the catalytic site allows for precise control over the catalytic microenvironment.
• This approach leads to superior catalytic performance, including enhanced reactivity, selectivity, and pathway control.
• The developed MOF catalysts offer a promising platform for advanced chemical synthesis.