Electrifying Redox-Neutral Palladium-Catalyzed Carbonylations: Multielectron Transfer as a Catalyst Driving Force

Area of Science:

• * Organic Chemistry
• * Electrochemistry
• * Catalysis

Background:

• * Palladium catalysts enable efficient synthesis of valuable products via carbonylation reactions.
• * Conventional palladium catalysis requires thermal regeneration, leading to high energy costs and limited applications.
• * Current methods necessitate high temperatures and pressures, restricting the scope of accessible products.

Purpose of the Study:

• * To develop an alternative palladium catalyst system driven by electrochemical potential.
• * To enable carbonylation reactions under mild, ambient conditions.
• * To explore a novel multi-electron exchange pathway for catalytic cycles.

Main Methods:

• * Design of a palladium catalyst system utilizing electrochemical potential for redox cycling.
• * Application of two-electron reduction for oxidative addition and two-electron oxidation for product elimination.
• * Conducting carbonylation reactions, including the synthesis of aroyl halide electrophiles, using electrochemical driving force.

Main Results:

• * Successful implementation of electrocatalysis for palladium-catalyzed carbonylation reactions.
• * Achievement of reactions at unprecedentedly mild ambient temperature and pressure.
• * Demonstration of a distinct multi-electron exchange pathway favoring both oxidative addition and product elimination.
• * Identification of electrochemical potential as the sole energy input.

Conclusions:

• * Electrocatalysis offers a sustainable and efficient alternative to traditional palladium catalysis.
• * The developed catalyst system broadens the scope of accessible products, including high-energy intermediates.
• * This approach provides a unique platform for driving reverse reactions in catalytic cycles using only electrical energy.