2,5-Dibromoterephthalic Acid CAS 13731-82-3
| CAS No. | 13731-82-3 |
| Molecular Formula | C8H4Br2O4 |
| Molecular Weight | 323.92 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 2,5-Dibromoterephthalic Acid is closely related to a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
2,5-Dibromoterephthalic Acid (CAS 13731-82-3), molecular formula C8H4Br2O4 and molecular weight 323.92 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 2,5-Dibromoterephthalic Acid (C8H4Br2O4) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C8H4Br2O4 |
| Molecular Weight | 323.92 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1960 |
| Halogen Content | Br-containing |
Recommended Standards
- 4-Bromo-3-iodo-1H-pyrazolo[3,4-b]pyridine (CAS 1357947-04-6)
- Bismuth vanadium oxide (CAS 14059-33-7)
- 4-Bromo-3-iodo-2H-pyrazolo[3,4-c]pyridine (CAS 1357946-92-9)
- 8-Bromo-6-iodo-[1,2,4]triazolo[1,5-a]pyridine (CAS 1415314-10-1)
- 2-(3-Cyclopropyl-1,2,4-oxadiazol-5-yl)morpholine hydrochloride (CAS 2138005-61-3)
- Chloculol (CAS 131652-35-2)
- 1-(6-amino-3,4-dihydro-2H-1,4-benzoxazin-4-yl)-2,2-dimethylpropan-1-one (CAS 1193387-38-0)
- Potassium n-hydroxymethyl-n-methyl dithiocarbamate (CAS 51026-28-9)
- Cam-in-1 (CAS 251994-14-6)
- 2-(4-(Difluoromethyl)-6-methyl-2-(trifluoromethoxy)pyridin-3-yl)acetonitrile (CAS 1361920-97-9)
- (R)-3-Phenyl-2-(2,2,2-trifluoroacetamido)propanoic acid (CAS 7656-14-6)
- N-allyl-1-(2,6-dinitro-4-(trifluoromethyl)phenyl)piperidine-4-carboxamide (CAS 306977-98-0)
- tert-Butyl 7-oxo-5-azaspiro[3.5]nonane-5-carboxylate (CAS 2375273-96-2)
- Tirzepatide Impurity 14 (CAS CATO-C4X-324014)
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