8-Bromo-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid CAS 90271-90-2
| CAS No. | 90271-90-2 |
| Molecular Formula | C9H5BrN2O3 |
| Molecular Weight | 269.05 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 269.05 g/mol gives 8-Bromo-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
8-Bromo-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid (CAS 90271-90-2), molecular formula C9H5BrN2O3 and molecular weight 269.05 g/mol, is a CATO reference standard with documented purity and traceability.
8-Bromo-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid (C9H5BrN2O3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C9H5BrN2O3 |
| Molecular Weight | 269.05 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
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- 3-Chloro-6-(3-fluoro-4-methoxyphenyl)-pyridazine (CAS 99452-78-5)
- 2-[3-(tert-Butyl)phenoxy]-5-(trifluoromethyl)-phenylamine (CAS 946773-30-4)
- (S)-2-amino-3-(4-bromophenyl)-2-methylpropanoic acid (CAS 747397-27-9)
- Clobetasol butyrate (CAS 25122-47-8)
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- 7-methyl-1,3-benzothiazole-2-carboxylic acid (CAS 1188226-86-9)
- Lithium metaborate dihydrate (CAS 15293-74-0)
- N-(2,5-dimethoxyphenyl)-3-(2-nitrophenoxy)thiophene-2-carboxamide (CAS 252027-02-4)
- Semaglutide Impurity 10 (CAS CATO-C4X-222610)
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