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Description
4-Fluoro-2-methoxybenzoic Acid is a substituted benzoic acid bearing a fluorine atom at the position para to the carboxylic acid group and a methoxy group at the ortho position. This arrangement gives a fluorinated building block with a distinctive steric and electronic profile, which is why it is widely used in the synthesis of pharmaceutical intermediates and fine chemicals. In the laboratory, the compound generally serves as an aromatic fragment ready to be coupled to amines or alcohols in order to construct the amide and ester frameworks that form the backbone of many active molecules designed by researchers.
What makes this material attractive is the interplay between its three substituents. The fluorine atom at the para position withdraws electron density inductively and increases the acidity of the carboxylic acid group, while at the same time blocking metabolic oxidation at that position once the final molecule is evaluated biologically. The methoxy group, sitting adjacent to the carboxylic acid, imposes moderate steric hindrance and allows an intramolecular hydrogen bonding interaction to form, so researchers frequently adjust the coupling reagent and the reaction time to keep amidation yields optimal. The methoxy group can also be demethylated when a free phenol is required at a later stage of the route.
In Indonesian laboratories, this building block is typically used in medicinal chemistry and fine chemical research groups at universities, government research institutes, and industrial R&D units working on pharmaceutical intermediates. It is normally handled on a small to moderate scale, weighed out for coupling reactions in a fume hood, and stored alongside other fluorinated aromatic reagents in the organic synthesis inventory. Researchers ordering it generally plan their route around its amide- and ester-forming reactivity.
Laboratory Applications
Amide bond formation: the carboxylic acid group is coupled directly to primary or secondary amines to build amide scaffolds that underpin many designed active molecules in medicinal chemistry programmes.
Ester synthesis: reaction with alcohols converts the acid into esters, giving researchers a convenient way to modify polarity, protect the acid function, or prepare prodrug-type fragments during route development.
Pharmaceutical intermediate preparation: the compound serves as a ready aromatic fragment in multi-step sequences toward pharmaceutical intermediates, sparing chemists the effort of installing the fluorine and methoxy substituents themselves.
Fine chemical synthesis: as a fluorinated building block with a defined substitution pattern, it is incorporated into fine chemical products where the specific electronic character of the aromatic ring matters.
Demethylation and phenol access: the ortho methoxy group can be demethylated later in a synthetic route when a free phenolic hydroxyl is needed, giving the building block additional downstream flexibility.
Specifications
Brand: TCI
Catalogue number: F0680
CAS number: 395-82-4
Category: Chemistry > Building Blocks > Fluorinated Building Blocks
Pack sizes: available in the standard research pack sizes offered by the manufacturer; please confirm the size required when ordering
Storage: keep in a cool, dry place in the tightly closed original container
Handling and Storage
Store the container tightly closed in a cool, dry, well-ventilated area away from direct sunlight, moisture, and sources of ignition, and keep it separated from strong bases and strong oxidising agents. The original manufacturer container is the most suitable storage vessel; if the material is transferred, use a clean, chemically compatible, tightly sealing container and label it clearly with the compound name and CAS number. Handle the solid in a fume hood, avoid generating dust, and wear a laboratory coat, safety goggles, and appropriate chemical-resistant gloves. Wash hands thoroughly after handling, and consult the manufacturer's safety data sheet before first use and before disposal.
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