Probing Intramolecular Electron Transfer in Redox Tag Processes.

Area of Science:

• Organic Chemistry
• Photochemistry
• Reaction Mechanisms

Background:

• Single-electron transfer (SET) is a fundamental process in chemistry.
• Investigating intramolecular SET mechanisms remains challenging.
• Understanding SET is crucial for designing new synthetic methodologies.

Purpose of the Study:

• To develop a novel method for probing intramolecular SET mechanisms.
• To evaluate the factors controlling intramolecular SET efficacy.
• To elucidate the pathways through which intramolecular SET occurs.

Main Methods:

• Utilizing redox tag-guided intermolecular formal [2 + 2] cycloaddition as a chemical probe.
• Employing experimental techniques to monitor reaction outcomes.
• Conducting theoretical calculations to support mechanistic interpretations.

Main Results:

• Demonstrated the utility of cycloaddition as a probe for intramolecular SET.
• Showcased the link between SET, carbon-carbon bond formation/cleavage, and cycloaddition/cross-metathesis.
• Provided evidence that intramolecular SET is governed by thermodynamic and kinetic factors.
• Confirmed that intramolecular SET can proceed through bonds, not exclusively through space.

Conclusions:

• Redox tag-guided cycloaddition is an effective strategy for mechanistic studies of intramolecular SET.
• Intramolecular SET processes are complex, involving both thermodynamic and kinetic control.
• The spatial and electronic requirements for intramolecular SET are more flexible than previously assumed.