Diethyl 5-oxo-4,5-dihydro-1H-pyrazole-1,3-dicarboxylate CAS 90438-40-7
| CAS No. | 90438-40-7 |
| Molecular Formula | C9H12N2O5 |
| Molecular Weight | 228.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Diethyl 5-oxo-4,5-dihydro-1H-pyrazole-1,3-dicarboxylate 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.
Diethyl 5-oxo-4,5-dihydro-1H-pyrazole-1,3-dicarboxylate (CAS 90438-40-7), molecular formula C9H12N2O5 and molecular weight 228.20 g/mol, is a CATO reference standard with documented purity and traceability.
Diethyl 5-oxo-4,5-dihydro-1H-pyrazole-1,3-dicarboxylate (C9H12N2O5) contains an amino-acid-derived structure, 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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C9H12N2O5 |
| Molecular Weight | 228.20 g/mol |
| Appearance | Off-white to pale 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) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Nitrogen Atoms | 2 |
Related Diethyl Standards
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Recommended Standards
- D715-2441 (CAS 54245-10-2)
- Dimethyl 2,5-dioxocyclohexane-1,4-dicarboxylate (CAS 6289-46-9)
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- Dimethyl 4-(methoxymethyl)-1H-pyrazole-3,5-dicarboxylate (CAS 2389007-95-6)
- 1-(2,6-Dimethylphenoxy)-3,3-dimethylbutan-2-amine (CAS 953881-15-7)
- 7-Hydroxyhexadecanoic acid (CAS 16899-02-8)
- Ethyl 3-(2-thienyl)-1,2,4-oxadiazole-5-carboxylate (CAS 261626-93-1)
- 3-(1-(Sec-butyl)-1H-pyrazol-4-yl)propan-1-amine (CAS 1339671-81-6)
- Tos-aminoxy-Boc-PEG4-Tos (CAS 1817735-42-4)
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- 1-phenylpiperazin-2-one (CAS 90917-86-5)
- 1-(3-Chloro-1,4-dioxo-1,4-dihydronaphthalen-2-yl)piperidine-4-carboxylic acid (CAS 500268-34-8)
- 2-(3,4-Dichlorophenyl)cycloheptan-1-one (CAS 1247624-42-5)
- Semaglutide impurity 66 (CAS CATO-C4X-222666)
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