3-Fluoro-4-methoxybenzoic acid (CAS number 403-20-3) is a fluorinated para-anisic acid derivative. The fluoride substituent enables nucleophilic aromatic substitution, while most of the reactivity centered on the carboxylic group. 3-Fluoro-4-methoxybenzoic acid can undergo various reactions, including Fischer esterification affording esters with ligustrazine moiety for the treatment of Alzheimer's disease.
Furthermore, 3-Fluoro-4-methoxybenzoic acid can be transformed into benzoyl chloride using thionyl chloride to enhance its reactivity, thereby providing a platform for Friedel-Craft acylation reaction. Additionally, 3-Fluoro-4-methoxybenzoic acid can be modified into hydrazide which is used in the synthesis of oxadiazoles for antimicrobial applications.