Redox-active ligand based Mn(I)-catalyst for hydrosilylative ester reduction

Area of Science:

• Organometallic Chemistry
• Catalysis
• Green Chemistry

Background:

• Hydrosilylation is a key transformation in organic synthesis.
• Developing efficient and sustainable catalytic systems for ester reduction is crucial.
• Polymethylhydrosiloxane (PMHS) offers an inexpensive and practical silicon source.

Purpose of the Study:

• To report a new manganese(I) catalyst for ester hydrosilylation.
• To utilize a redox-active phenalenyl (PLY) ligand for enhanced catalytic activity.
• To achieve efficient reduction of esters to alcohols under mild conditions.

Main Methods:

• Synthesis and characterization of a Mn(I) complex with a PLY ligand.
• Catalytic testing for the hydrosilylation of various esters using PMHS.
• Mechanistic studies including kinetic and spectroscopic analyses.

Main Results:

• The Mn(I)-PLY catalyst demonstrated high efficiency in ester to alcohol conversion.
• The reaction proceeded under mild conditions with PMHS as the reductant.
• Mechanistic studies revealed a ligand-metal cooperation mechanism involving single electron transfer (SET).

Conclusions:

• A novel and efficient Mn(I) catalyst for ester hydrosilylation has been developed.
• The catalyst's activity is attributed to ligand-metal cooperation and SET-initiated Si-H bond activation.
• This work offers a sustainable route for alcohol synthesis from esters.