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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

3-(4-Bromophenyl)isoxazole | CAS 13484-04-3

A research building block joining isoxazole C3 to a para-bromophenyl group, with an unsubstituted C5 position and a retained aryl bromide for subsequent synthetic development; regioisomer identity is central to qualification.

CAS13484-04-3
Molecular formulaC9H6BrNO
Molecular weight224.05 g/mol

Product overview

A phenyl group at isoxazole C3 and bromine para to that connection define this neutral heteroaromatic research building block. The isoxazole C5 position is unsubstituted, distinguishing it from carboxylate, hydroxymethyl and methyl derivatives. The molecule offers a compact aryl–isoxazole framework for laboratory synthesis while retaining the aryl bromide functionality. Selecting the correct regioisomer is important because different attachment positions can share the same molecular formula and mass. Review NMR or comparable structural data alongside the chromatographic profile. Where the intended transformation relies on the aryl bromide, agree controls for relevant debrominated or otherwise altered aromatic species, as well as the required assay basis.

Chemical identity

Chemical name
3-(4-Bromophenyl)isoxazole
CAS number
13484-04-3
Molecular formula
C9H6BrNO
Molecular weight
224.05 g/mol

Application context

This arylisoxazole is a building block for laboratory synthesis, combining a preformed nitrogen–oxygen heteroaromatic ring with a para aryl bromide. Match the C3 attachment and unsubstituted isoxazole C5 to the research sequence. For work relying on the aryl bromide, request identity data and a method that separates relevant debrominated or positionally altered species. Agree assay and impurity criteria for the intended transformation.

Chemistry and synthetic role

Isoxazole contains adjacent nitrogen and oxygen atoms in a five-membered aromatic ring. The C3–phenyl bond and para C–Br bond are distinct structural features. There is no free amino, alcohol or carboxylic acid group in this CAS-defined molecule.

Quality review

Confirm the 3-aryl isoxazole

Use NMR or comparable structural evidence to distinguish attachment at isoxazole C3 from C5. Matching formula or nominal mass alone cannot resolve those isomers.

Check the aryl bromide

For a transformation relying on bromine, discuss separation of debrominated or otherwise altered aromatic species. Set limits from the receiving reaction rather than assuming every impurity has equal impact.

Exclude substituted C5 analogues

Ask for explicit identity rather than an abbreviated bromophenylisoxazole label. Hydroxymethyl and carboxylate derivatives are different starting materials.

Preparing a specification

Specify the 3-(4-bromophenyl) structure with an unsubstituted isoxazole C5 position. Request assay with its method, relevant positional-isomer controls and a chromatogram appropriate to the intended research transformation.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request identity spectra, method details and batch chromatographic evidence. Confirm availability of SDS and COA for the selected grade; if a specific downstream application is required, provide its acceptance criteria for technical review.

Procurement questions

How is this material distinguished from C5-substituted analogues?

Specify an unsubstituted isoxazole C5 position together with CAS 13484-04-3. Hydroxymethyl, carboxylate and methyl substituents identify different building blocks.

Which controls matter for a reaction using the aryl bromide?

Confirm the para-bromo structure and review separation of debrominated or altered aromatic species against the requirements of the intended transformation.

Why request NMR when mass agrees?

Positionally different arylisoxazoles may share the same formula and mass.

Technical sources
  1. 3-(4-Bromophenyl)isoxazole 697028Sigma-Aldrich
  2. SDS for 3-(4-Bromophenyl)isoxazoleSigma-Aldrich
  3. Wako Organic Square No. 29FUJIFILM Wako