Direct Acetoxylation of Arenes

Area of Science:

• Organic Chemistry
• Synthetic Methodology

Background:

• Acetoxylation of arenes is a crucial transformation in organic synthesis.
• Existing methods often require metal catalysts or harsh conditions, presenting limitations.

Purpose of the Study:

• To develop a novel, metal-free method for the direct acetoxylation of arenes.
• To establish a regioselective and high-yielding synthetic route using readily available reagents.

Main Methods:

• Employing sodium nitrate as the oxidant in an anhydrous mixture of trifluoroacetic acid, acetic acid, and acetic anhydride.
• Investigating the reaction scope with 31 diverse arene substrates.
• Analyzing substrate oxidation potentials to determine reactivity trends.

Main Results:

• Successful acetoxylation of 31 arene examples with good yields and regioselectivity.
• Demonstrated applicability to arenes with oxidation potentials lower than benzene (2.48 V vs SCE).
• Proposed a stepwise, single electron-transfer mechanism to explain the reaction pathway.

Conclusions:

• A practical and efficient metal-free protocol for arene acetoxylation has been established.
• The method provides a valuable alternative to existing catalytic approaches.
• The findings contribute to the advancement of direct functionalization strategies in organic chemistry.