Ethyl 1-(4-nitrophenyl)-1h-pyrazole-3-carboxylate CAS 19532-38-8
| CAS No. | 19532-38-8 |
| Molecular Formula | C12H11N3O4 |
| Molecular Weight | 261.23 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Ethyl 1-(4-nitrophenyl)-1h-pyrazole-3-carboxylate (CAS 19532-38-8), molecular formula C12H11N3O4 and molecular weight 261.23 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of Ethyl 1-(4-nitrophenyl)-1h-pyrazole-3-carboxylate (C12H11N3O4) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
As a certified reference material (CRM), Ethyl 1-(4-nitrophenyl)-1h-pyrazole-3-carboxylate meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C12H11N3O4 |
| Molecular Weight | 261.23 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Nitrogen Atoms | 3 |
Related Ethyl Standards
- Ethyl 5-(3-nitrophenyl)-1H-pyrazole-3-carboxylate (CAS 1025724-57-5)
- 5-Ethyl-1-(4-nitrophenyl)-1h-pyrazole-4-carboxylic acid (CAS 1152882-20-6)
- 2-(3-Nitrophenyl)tetrahydro-1H-pyrrolo[1,2-c]imidazole-1,3(2H)-dione (CAS 1189765-13-6)
- Ethyl 1-(2-nitrophenyl)-1H-pyrazole-3-carboxylate (CAS 1258657-50-9)
- Ethyl 1-(4-nitrophenyl)-1H-pyrazole-4-carboxylate (CAS 91397-55-6)
- Ethyl 3-(3-nitrophenyl)-1H-pyrazole-4-carboxylate (CAS 448187-55-1)
- Ethyl 5-(4-nitrophenyl)-1H-pyrazole-3-carboxylate (CAS 854700-38-2)
- Ethyl 5-(4-nitrophenyl)-1h-pyrazole-4-carboxylate (CAS 35487-11-7)
Recommended Standards
- 1,3-Dioxoisoindolin-2-yl tetrahydrofuran-2-carboxylate (CAS 1872262-69-5)
- Ethyl 6-oxo-5,6-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxylate (CAS 19658-64-1)
- 3-[(1,3-Benzodioxol-5-ylmethyl)amino]-4-methoxycyclobut-3-ene-1,2-dione (CAS 1858249-84-9)
- (2-(4-Hydroxyphthalazin-1-yl)acetyl)glycine (CAS 919724-88-2)
- 7-(Hydroxymethyl)-1H-pyrido[3,4-b][1,4]oxazin-2(3H)-one (CAS 615568-79-1)
- 1-Bromo-4-iodo-2,5-dimethylbenzene (CAS 699119-05-6)
- N-[(1R*,4R*)-4-Aminocyclohexyl]-tetrahydro-2H-pyran-4-carboxamide hydrochloride (CAS 1286263-78-2)
- 4-Ethynyl-2-methoxyhexahydro-2H-cyclopenta[b]furan (CAS 61401-35-2)
- tert-Butyl 6-methoxy-1H-indole-1-carboxylate (CAS 138344-18-0)
- (R)-2-Amino-N,N,3,3-tetramethylbutanamide (CAS 609367-37-5)
- 6-Chloro-4-ethyl-1,2,3,4-tetrahydroisoquinoline hydrochloride (CAS 1243461-33-7)
- [(2S,5S)-5-methyloxolan-2-yl]methanol (CAS 16015-08-0)
- 4-Bromo-5-propylthiophene-2-carboxylic acid (CAS 869951-15-5)
- Neuropeptide AF (human) (CAS 192387-38-5)
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