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HONGKUN / PRODUCT DIRECTORY

4-Phenoxybenzoic acid | CAS 2215-77-2

A para-carboxylated diaryl ether used as an aromatic building block and ligand precursor, combining a derivatizable acid group with a two-ring scaffold for coordination and molecular-recognition research.

CAS2215-77-2
Molecular formulaC13H10O3
Molecular weight214.22 g/mol

Product overview

An ether oxygen joins the two phenyl rings, and the carboxylic acid occupies the para position on one ring. This architecture differs from the 2- and 3-phenoxybenzoic acid isomers and from directly linked biphenyl carboxylic acids. The acid group can be assessed independently from the aromatic ether structure during qualification.

Chemical identity

Chemical name
4-Phenoxybenzoic acid
CAS number
2215-77-2
Molecular formula
C13H10O3
Molecular weight
214.22 g/mol

Application context

Published work describes copper(II) complexes containing 4-phenoxybenzoate ligands, including dimeric and monomeric structures. Protein structural studies also use 4-phenoxybenzoic acid as a ligand. These are research contexts in which substitution position, acid form and solution composition matter. For coordination trials, specify whether free acid or a preformed salt is required and identify residual ions or metals that could interfere with the selected metal–ligand system.

Chemistry and synthetic role

Deprotonation gives a carboxylate coordination site; the diaryl ether remains a separate structural and hydrogen-bond-accepting feature.

Quality review

Verify para phenoxy substitution

Use structure-sensitive identification to distinguish the 2- and 3-isomers.

Confirm acid form and content

Separate free acid from esterified or salt forms and define titration versus chromatographic assay.

Control ions for coordination

Set residual-ion or metal criteria according to the planned complexation system.

Preparing a specification

Request the para-phenoxy free acid, identity, assay method, positional impurities and ions relevant to ligand or derivatization work.

Packaging and storage

Confirm container compatibility, closure and net weight for the selected grade and destination. Follow the actual supplier SDS and batch label for storage and transport.

Documentation

Request the batch COA, SDS and analytical methods covering the agreed purchasing specification. Confirm which supporting chromatograms and application-specific records are available from the selected manufacturer.

Procurement questions

Is this the 3-phenoxybenzoic acid isomer?

No. The phenoxy group is para to the carboxyl group.

What site binds in the cited copper complexes?

The carboxylate derived from the acid participates in coordination.

Should a metal salt be requested instead?

Specify the form required by the experimental route; the listed material is the free acid.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. 4-Phenoxybenzoic acidFisher Scientific
  3. JO4 ligand: 4-phenoxybenzoic acidRCSB Protein Data Bank
  4. Cu(II) 4-phenoxybenzoate dimers and monomerUniversity of Barcelona repository