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Description
3-Fluoro-5-(trifluoromethyl)benzoic Acid is a benzoic acid whose two meta positions each carry a fluorinated substituent: one fluorine atom and one trifluoromethyl group. This double meta substitution pattern produces an aromatic framework that is functionally symmetrical while leaving the carboxyl group free of steric hindrance. In laboratory practice, the compound serves as an intermediate whose carboxyl group is activated directly for the formation of amides, esters, or heterocyclic rings, making it a popular choice for the rapid assembly of test compound libraries.
The property underlying its selection is the balance between good reactivity and strong electronic influence. Because both substituents sit at meta positions, they act on the ring primarily through inductive effects without sterically blocking the carboxyl group, so coupling reactions proceed with yields that are usually satisfactory. The trifluoromethyl group contributes lipophilicity and protection against metabolic oxidation, while the meta fluorine atom closes off one ring position that is otherwise vulnerable to hydroxylation. The two distinct fluorine environments also give a characteristic signal pattern in fluorine NMR that makes identity verification straightforward.
In Indonesian laboratories, this building block is typically found in synthetic and medicinal chemistry groups at universities and research institutes, as well as in formulation and development units that prepare candidate compound series. It is generally used at small to medium scale on the bench, where the carboxyl group is converted into a derivative in the following step. The clear fluorine NMR signature is valued in facilities that rely on routine spectroscopic checks to confirm the identity of incoming material before it enters a reaction sequence.
Laboratory Applications
Amide coupling and library synthesis — the unhindered carboxyl group is activated directly with standard coupling reagents, allowing many amine partners to be screened quickly in parallel series.
Ester formation for intermediate preparation — esterification of the free carboxyl proceeds without steric interference, giving protected or modified intermediates for the next stage of a synthetic route.
Heterocyclic ring construction — the carboxyl function serves as the entry point for cyclisation chemistry that builds fluorinated heterocyclic cores onto the doubly meta-substituted aromatic framework.
Medicinal chemistry lead modification — the trifluoromethyl group adds lipophilicity and resistance to metabolic oxidation, while the meta fluorine blocks a ring position otherwise prone to hydroxylation.
Fluorine NMR reference and method development — the two distinct fluorine environments produce a characteristic signal pattern useful for verifying identity and for developing analytical checks on fluorinated series.
Specifications
Brand: TCI
CAS number: 161622-05-5
Category: Chemistry > Building Blocks > Fluorinated Building Blocks
Catalogue code: F0759
Pack sizes: available in standard laboratory research pack sizes; please confirm the current options when ordering.
Storage: keep in the tightly closed original container under the conditions stated on the manufacturer's label.
Handling and Storage
Store the material in its tightly closed original container, kept in a cool, dry, and well-ventilated place away from moisture, direct sunlight, and incompatible reagents, following the conditions printed on the manufacturer's label. Chemically resistant glass or the supplied container is suitable for storage, and transfers should be made with clean, dry spatulas to avoid contamination. Handle as an organic acid: work in a fume hood, wear safety glasses, a laboratory coat, and appropriate chemical-resistant gloves, and avoid contact with skin, eyes, and inhalation of dust. Consult the manufacturer's safety data sheet before use, and dispose of residues and contaminated materials through the laboratory's chemical waste route.
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