Fluorination of Aromatic Compounds Using Electrochemical Fluorination in Anhydrous Hydrogen Fluoride Electrolyte

Abstract

Fluorinated aromatic compounds are important intermediates in pharmaceutical, agrochemical, polymer, and specialty chemical industries due to their enhanced thermal stability, chemical resistance, and biological activity. The present study investigates the fluorination of aromatic compounds using electrochemical fluorination in anhydrous hydrogen fluoride electrolyte under controlled reaction conditions. The research focuses on evaluating the influence of current density, electrolyte composition, reaction temperature, electrolysis duration, and substrate structure on fluorination efficiency, product selectivity, and electrochemical performance. Experimental analysis demonstrates that electrochemical fluorination enables the effective substitution of hydrogen atoms in aromatic compounds with fluorine through anodic oxidation mechanisms within the hydrogen fluoride medium. The highly conductive and reactive nature of anhydrous hydrogen fluoride facilitates fluorine transfer reactions while promoting stable electrochemical operation. Results indicate that optimized operating parameters significantly improve fluorinated product yield and selectivity while minimizing undesirable side reactions and decomposition products. The study further reveals that electrode material selection and controlled electrochemical conditions strongly influence reaction kinetics and fluorination pathways. Comparative assessment with conventional chemical fluorination methods confirms the advantages of electrochemical fluorination, including reduced reagent consumption, improved process controllability, and enhanced product purity. In addition, the process demonstrates potential for scalable industrial implementation in the synthesis of high-value fluorinated aromatic intermediates. Safety considerations associated with handling anhydrous hydrogen fluoride and electrochemical operation were also evaluated to support sustainable process development.