Epoxyethane Methoxycarbonylation over a Heterogeneous Catalyst Based on Functionalized Cobalt Carbonyl

Area of Science:

• Catalysis
• Materials Science
• Organic Chemistry

Background:

• Methoxycarbonylation reactions are crucial for synthesizing valuable organic compounds.
• Developing efficient and recyclable heterogeneous catalysts remains a key challenge in chemical synthesis.
• Epoxyethane (EO) methoxycarbonylation to methyl 3-hydroxypropanoate (3-HPM) is an important industrial process.

Purpose of the Study:

• To develop a novel heterogeneous catalyst for the methoxycarbonylation of epoxyethane (EO).
• To investigate the catalytic performance, recyclability, and reaction mechanism of the new catalyst.
• To establish structure-activity relationships for enhanced catalytic efficiency.

Main Methods:

• Synthesis of functionalized silica-based molecular sieves.
• Anchoring of active cobalt carbonyl species onto the functionalized supports.
• Characterization using ²⁹Si-MAS NMR and FT-IR spectroscopy.
• In situ FT-IR studies to monitor reaction intermediates and mechanisms.

Main Results:

• Achieved good yields of methyl 3-hydroxypropanoate (3-HPM) from epoxyethane (EO) methoxycarbonylation.
• Demonstrated catalyst recyclability up to three times with no significant loss in activity.
• Identified a shift from bridged to terminal carbonyl in the binuclear cobalt carbonyl catalyst.
• Captured key intermediates and products, revealing a novel reaction mechanism.

Conclusions:

• The developed heterogeneous cobalt carbonyl catalyst is effective for EO methoxycarbonylation.
• The catalyst exhibits excellent recyclability and stability.
• The study provides new mechanistic insights into the methoxycarbonylation reaction pathway.