Halogen-Bonding-Enabled Photoinduced Atom Transfer Radical Addition/Cyclization Reaction Leading to Tricyclic...

Area of Science:

• Organic Chemistry
• Photochemistry
• Catalysis

Background:

• Atom transfer radical addition (ATRA) reactions are vital for dual functionalization of unsaturated hydrocarbons.
• Radical generation is key to ATRA, evolving from thermal to photochemical techniques.
• Transition-metal catalysts are commonly used but can be expensive and require high-energy UV light.

Purpose of the Study:

• To develop a cost-effective and efficient photochemical method for radical generation in ATRA reactions.
• To explore halogen-bonding-based radical generation as an alternative to transition-metal photocatalysts.
• To enhance ATRA efficiency using noncovalent interactions and visible light.

Main Methods:

• Utilized a novel photochemical approach for radical generation.
• Employed halogen-bonding interactions to initiate radical formation.
• Investigated the use of noncovalent interactions instead of transition-metal catalysts.
• Applied visible light instead of high-energy UV light.

Main Results:

• Successfully generated radicals using a photochemical halogen-bonding strategy.
• Demonstrated the feasibility of ATRA reactions without transition-metal photocatalysts.
• Achieved efficient dual functionalization of unsaturated hydrocarbons.
• Showcased enhanced reaction efficiency through noncovalent interactions.

Conclusions:

• The developed photochemical method provides a cost-effective and efficient alternative for ATRA reactions.
• Halogen-bonding-based radical generation offers a promising avenue for sustainable chemistry.
• This approach eliminates the need for expensive transition metals and high-energy UV irradiation, making ATRA more accessible.