[60]Fullerene-Fused ζ-Lactones: Synthesis and Further Transformations

Area of Science:

• Organic Chemistry
• Materials Science
• Nanotechnology

Background:

• Fullerenes (C60) are unique carbon allotropes with significant potential in materials science.
• Developing novel fullerene derivatives is crucial for advancing applications in electronics and energy.

Purpose of the Study:

• To synthesize novel fullerene (C60)-fused ζ-lactones.
• To explore their structural transformations and potential applications in organic electronics.

Main Methods:

• Palladium-catalyzed annulation of C60 with 2-arylbenzoic acids.
• Carboxyl-directed C-H activation for lactone formation.
• Deoxygenative skeletal rearrangement using triflic anhydride.
• Single-crystal X-ray diffraction for structural confirmation.

Main Results:

• Successful synthesis of novel C60-fused ζ-lactones with an eight-membered ring.
• Generation of C60-fluorenone conjugates via skeletal rearrangement.
• Electrochemical transformation of ζ-lactones into 1,2-hydrofullerenes.
• Demonstrated improved performance in organic solar cells using a C60-fused ζ-lactone component.

Conclusions:

• A new synthetic route to C60-fused ζ-lactones has been established.
• These lactones serve as versatile precursors for advanced fullerene derivatives.
• The study highlights the potential of these novel compounds in organic solar cell technology.