Ethyl 7-(3-nitrophenyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate CAS 765292-65-7
| CAS No. | 765292-65-7 |
| Molecular Formula | C15H12N4O4 |
| Molecular Weight | 312.28 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
Ethyl 7-(3-nitrophenyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate (CAS 765292-65-7) is a high-purity analytical reference standard with the molecular formula C15H12N4O4 and a molecular weight of 312.28 g/mol.
Ethyl 7-(3-nitrophenyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate (C15H12N4O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, 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).
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 | C15H12N4O4 |
| Molecular Weight | 312.28 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
| Nitrogen Atoms | 4 |
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- Azilsartan Impurity 118 (CAS CATO-C4X-1096118)
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- (3-Fluoro-5-isopropoxy-4-methylphenyl)methanamine (CAS 1429902-48-6)
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- (S)-2-((tert-butoxycarbonyl)amino)-3-(4'-methoxy-[1,1'-biphenyl]-4-yl)propanoic acid (CAS 809231-57-0)
- Semaglutide impurity 196 (CAS CATO-C4X-2226196)
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