Practical beta-lactone synthesis: epoxide carbonylation at 1 atm

Area of Science:

• Organic Chemistry
• Catalysis
• Green Chemistry

Background:

• Epoxide carbonylation is a key reaction for synthesizing valuable compounds.
• Existing methods often require high carbon monoxide (CO) pressures, limiting accessibility and scalability.
• Development of efficient catalysts operating under mild conditions is crucial.

Purpose of the Study:

• To develop a readily prepared bimetallic catalyst for epoxide carbonylation.
• To achieve high yields of beta-lactones under significantly reduced CO pressures.
• To enable scalable synthesis of beta-lactones without specialized high-pressure equipment.

Main Methods:

• Preparation of a novel bimetallic catalyst.
• Reaction of various epoxides with carbon monoxide (CO) in the presence of the catalyst.
• Optimization of reaction conditions, focusing on low CO pressures.

Main Results:

• The bimetallic catalyst effectively promotes epoxide carbonylation to produce beta-lactones.
• Excellent yields of a diverse range of beta-lactones were achieved at CO pressures as low as 1 atm.
• The process demonstrated scalability for multigram synthesis.

Conclusions:

• A highly efficient and accessible catalytic system for beta-lactone synthesis has been developed.
• The catalyst operates under mild, low-pressure conditions, offering a significant advantage over previous methods.
• This work facilitates broader application of epoxide carbonylation for producing valuable beta-lactones.