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HONGKUN / PRODUCT DIRECTORY

2-[4-(Bromomethyl)phenyl]propionic acid (BMPPA) | CAS 111128-12-2

A benzylic-bromide intermediate in loxoprofen chemistry, carrying an arylpropionic acid group whose functional form and stereochemical requirements should be defined for the intended route.

CAS111128-12-2
Molecular formulaC10H11BrO2
Molecular weight243.1 g/mol

Product overview

BMPPA places a bromomethyl group para to the phenylpropionic acid side chain. Bromine is bonded to the benzylic carbon rather than directly to the aromatic ring, giving the molecule a substitution handle distinct from an aryl bromide. The alpha carbon of the acid side chain is stereogenic, but this catalogue identity does not specify one configuration. Procurement should identify the intended free acid, stereochemical scope and integrity of the bromomethyl function.

Chemical identity

Chemical name
2-[4-(Bromomethyl)phenyl]propionic acid (BMPPA)
CAS number
111128-12-2
Molecular formula
C10H11BrO2
Molecular weight
243.1 g/mol

Application context

Published patents identify BMPPA as an intermediate for loxoprofen sodium. A research route converts the free acid into its ester before carbon-chain assembly with a cyclopentanone-derived partner, illustrating how its benzylic bromide contributes to the downstream skeleton. The same CAS also appears in loxoprofen impurity-reference catalogues. Synthesis material and quantitative impurity standards should be qualified separately: the former emphasizes reactive identity and related species, while the latter additionally requires an assigned content appropriate to the analytical method.

Chemistry and synthetic role

The benzylic C–Br site supports substitution chemistry, while the acid group can be esterified for route compatibility. These functions occupy different side chains on a para-disubstituted ring.

Quality review

Bromomethyl location

Verify a para benzylic bromide and distinguish ring-brominated or differently substituted aromatic species.

Reactive-site impurities

Review unconverted or transformed bromomethyl-related species with an appropriate chromatographic method.

Stereochemical and content basis

State whether stereochemical control is required; for analytical standards, define assigned content rather than relying only on area purity.

Preparing a specification

Request free-acid BMPPA with para-substitution identity, bromomethyl-related-substance controls, assay and any required stereochemical specification; identify reference-standard use explicitly.

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 the bromine attached directly to the phenyl ring?

No. It is part of a benzylic CH2Br group.

Does this name specify an enantiomer?

No single configuration is designated; include any stereochemical requirement in the RFQ.

Why is it also sold as a loxoprofen impurity?

The same molecule is used as an analyte in loxoprofen-related-substance work; reference grades have separate qualification requirements.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. 2-[4-(Bromomethyl)phenyl]propionic AcidTCI
  3. Preparation method of 2-(4-bromomethyl)phenylpropionic acidPatent applicants / Google Patents
  4. Synthesis of N-heterocycles — loxoprofen analogue chemistryUniversity College London
  5. Loxoprofen Impurity 1SynZeal