Red Light and Supersilane: A Novel Pathway for Hydrofunctionalizations and Giese Reactions

Area of Science:

• Organic Chemistry
• Photocatalysis
• Radical Chemistry

Background:

• Traditional photoredox catalysis often relies on visible or UV light.
• Activating silanes to generate silyl radicals is synthetically valuable but challenging.
• Deep-red light offers unique advantages for photoredox reactions due to its penetration and lower energy.

Purpose of the Study:

• To develop novel deep-red light-mediated photoredox protocols for silane activation.
• To explore new reactivities of silyl radicals generated under deep-red irradiation.
• To demonstrate the preparation of diverse high-value molecules using these new methods.

Main Methods:

• Photoredox activation of silanes using deep-red light.
• Utilizing osmium-based photocatalysts (optional).
• Employing generated silyl radicals in various organic transformations.

Main Results:

• Successful generation of silyl radicals under deep-red irradiation.
• Demonstration of previously unexplored red-light reactivities: hydrosilylation, hydrosulfonylation, and Giese reaction.
• Preparation of a diverse range of valuable organic molecules.

Conclusions:

• Deep-red photoredox catalysis provides a powerful new tool for silane activation.
• The developed protocols enable novel synthetic pathways under accessible red-light conditions.
• This methodology broadens the scope of radical chemistry in the red-light spectral region.