Electrosynthesis Using Carboxylic Acid Derivatives: New Tricks for Old Reactions

Area of Science:

• Organic Chemistry
• Green Chemistry
• Electrochemistry

Background:

• Electrosynthesis, rooted in Faraday's work, offers a sustainable alternative to traditional synthesis.
• The field is experiencing a resurgence driven by the demand for economical and efficient chemical methodologies.
• Electrons serve as the primary reagent, aligning with green chemistry principles.

Purpose of the Study:

• To summarize recent developments in electrosynthesis involving carboxylic acid derivatives.
• To explore novel applications of ester and carboxylic acid electrochemistry in organic synthesis.
• To highlight the enduring relevance of classical reactions like the Kolbe reaction in modern chemistry.

Main Methods:

• Investigating the monoelectronic reduction of aromatic esters to understand radical anion behavior.
• Developing electrochemical alcohol deoxygenation using aromatic esters as radical precursors.
• Examining anodic oxidation of carboxylic acids, including the Kolbe and Hofer-Moest reactions.

Main Results:

• Aromatic esters form stable radical anions that can decompose to carboxylates and alkyl radicals.
• A novel electrochemical alcohol deoxygenation reaction was developed.
• The Kolbe reaction and its variants demonstrate continued utility, with new applications in ether formation and carbonyl synthon generation.

Conclusions:

• Electrosynthesis provides a powerful and versatile tool for organic synthesis.
• Carboxylic acid derivatives, particularly esters and acids, are valuable substrates for electrosynthetic transformations.
• Electrosynthesis is poised to become a fundamental method for activating small organic molecules.