Singlet Oxygen: Discovery, Chemistry, C₆₀ -Sensitization

Area of Science:

• Photochemistry
• Organic Chemistry
• Materials Science

Background:

• Singlet oxygen (¹O₂) is a highly reactive form of molecular oxygen.
• Understanding its generation and reactivity is crucial for various chemical applications.

Purpose of the Study:

• To review the discovery and chemistry of singlet oxygen (¹O₂).
• To discuss its reactions with unsaturated organic substrates and synthetic applications.
• To explore fullerene-based photosensitized oxidations.

Main Methods:

• Review of experimental and computational studies on singlet oxygen reactions.
• Analysis of cycloaddition and ene reactions involving ¹O₂.
• Discussion of photooxidation processes with fullerenes.

Main Results:

• Detailed mechanisms for [4+2] and [2+2] cycloadditions and ene reactions of ¹O₂ are presented.
• Synthetic applications of singlet oxygen are highlighted.
• Fullerene-mediated photosensitized oxidations under various conditions are discussed.

Conclusions:

• Singlet oxygen exhibits diverse reactivity with organic substrates.
• Fullerenes serve as effective photosensitizers for oxidation reactions.
• Photooxidation of fullerenes themselves offers novel synthetic pathways.