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4-Fluorobenzoic acid | CAS 456-22-4

A para-fluorinated aromatic acid used to introduce a fluorobenzoyl fragment through carboxyl-group chemistry, including published medicinal chemistry studies of tacrine-derived hybrid molecules.

CAS456-22-4
Molecular formulaC7H5FO2
Molecular weight140.11 g/mol

Product overview

Fluorine at the para position distinguishes 4-fluorobenzoic acid from the other monofluorobenzoic acid isomers. Its carboxyl group provides a site for acyl derivative formation while the ring retains the defined fluorination pattern. Published medicinal chemistry work has used the activated acid in coupling with amino-functional tetrahydroacridine derivatives. For buyers, the central identity requirement is the free para-fluoro acid, CAS 456-22-4, rather than an ester, acid chloride or another positional isomer. Qualification should combine structural identification with an assay suited to the intended route. Material intended as an analytical reference also requires separately agreed value assignment and traceability; a synthesis-grade purity result alone does not establish those features.

Chemical identity

Chemical name
4-Fluorobenzoic acid
CAS number
456-22-4
Molecular formula
C7H5FO2
Molecular weight
140.11 g/mol

Application context

In published tacrine hybrid research, activated 4-fluorobenzoic acid was reacted with diamino derivatives of tetrahydroacridine. The acid supplies the para-fluorobenzoyl component of the resulting molecules, which were then evaluated in biochemical and analytical studies. The free acid was also considered in the related HPLC impurity analysis. This is a research context for a fluorinated aromatic building block. When selecting material for synthesis, focus on the correct fluoro isomer and carboxyl functionality. For analytical use, define the required reference-material characteristics and uncertainty or traceability documentation separately from the requirements for a reaction feedstock.

Chemistry and synthetic role

COOH and F occupy opposite positions of the benzene ring. Activation of the carboxyl group enables acyl coupling without changing the intended para-fluorinated aromatic fragment.

Quality review

Resolve the fluorobenzoic acid isomers

Request structure-specific identification and a method suitable for positional-isomer review.

Confirm the free carboxylic acid

Distinguish the requested acid from salts, esters and acid chlorides, and state the assay basis.

Separate reagent and reference requirements

If used for quantitation, agree assigned content and traceability rather than inferring reference-standard status from purity.

Preparing a specification

Specify the free 4-fluoro acid, CAS 456-22-4, assay method, positional-isomer limits and water basis. State explicitly whether the enquiry is for synthesis or a qualified analytical reference.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Does the fluorine leave during the cited coupling?

The cited application uses the carboxyl function to introduce the para-fluorobenzoyl fragment.

Are all fluorobenzoic acid isomers equivalent?

No. Their fluorine positions define different aromatic structures.

Can a synthesis reagent automatically serve as a quantitative standard?

Only after suitability, assigned content and the necessary traceability have been established.

Technical sources
  1. 4-Fluorobenzoic acid 128384Sigma-Aldrich
  2. Synthesis and HPLC validation of tetrahydroacridine derivativesEuropean Journal of Medicinal Chemistry / PubMed
  3. 4-Fluorobenzoic acid SDSSigma-Aldrich