1-(3-Aminophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid CAS 89-26-9
| CAS No. | 89-26-9 |
| Molecular Formula | C10H9N3O3 |
| Molecular Weight | 219.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 1-(3-Aminophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 219.20 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
1-(3-Aminophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid (CAS 89-26-9), molecular formula C10H9N3O3 and molecular weight 219.20 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C10H9N3O3 |
| Molecular Weight | 219.20 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (faint amine-like odor) |
| 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 |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 3 |
Related Aminophenyl Standards
- 2-(5-(4-Aminophenyl)-2H-tetrazol-2-yl)acetic acid (CAS 1091990-56-5)
- 2-(5-(3-Aminophenyl)-2H-tetrazol-2-yl)acetic acid (CAS 924859-00-7)
- (3-aminophenyl)sulfurpentafluoride (CAS 2993-22-8)
- 3-(3-Aminophenyl)-5-ethylimidazolidine-2,4-dione (CAS 1218200-51-1)
- 3-(3-Aminophenyl)-5,5-dimethylimidazolidine-2,4-dione (CAS 1249525-89-0)
- 3-((3-Aminophenyl)amino)piperidine-2,6-dione (CAS 1472731-41-1)
- 5-(4-aminophenyl)-3,5-dimethylimidazolidine-2,4-dione (CAS 1909319-00-1)
- 1-(4-aminophenyl)-3-methyl-hexahydropyrimidine-2,4-dione (CAS 791021-42-6)
Recommended Standards
- 1-(2-Methoxy-5-nitrophenyl)-1H-imidazole (CAS 61292-63-5)
- 1-(3-Methoxyphenyl)-1H-1,2,3-triazole-4-carboxylic acid (CAS 944901-61-5)
- 1-(2-aminopropoxy)-2-(trifluoromethyl)benzene (CAS 883542-94-7)
- 1-(3-Methyl-6-nitro-1H-indazol-1-yl)ethan-1-one (CAS 62235-14-7)
- (R)-2-(4-Hydroxy-6-methylnicotinamido)-2-(4-hydroxyphenyl)acetic acid (CAS 70785-61-4)
- 1,4-Dimethoxy-2,3-bis(trifluoromethyl)benzene (CAS 105996-53-0)
- Methyl 3-amino-3-(2-fluoro-4-methylphenyl)propanoate (CAS 1824482-06-5)
- 2-(Bromomethyl)-5-phenylpyridine (CAS 126268-58-4)
- (S)-4-oxo-4-(1-phenylethylamino)butanoic acid (S)-N-(1-Phenylethyl)succinic acid monoamide 21752-34-1 (CAS 21752-34-1)
- 2-(2,4-Dichlorobenzylidene)-6-hydroxybenzofuran-3(2h)-one (CAS 637753-86-7)
- Bromobenzene-d5 (CAS 4165-57-5)
- Ethyl 4-Acetamidophenylacetate (CAS 13475-17-7)
- 6-(4-Ethylpiperazin-1-yl)pyrimidine-4-carboxylic acid (CAS 1097254-86-8)
- Tirzepatide Impurity 46 (CAS CATO-C4X-324046)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com