1H-Pyrazol-5(4H)-one CAS 137-44-0
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 137-44-0 |
| Molecular Formula | C3H4N2O |
| Molecular Weight | 84.08 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1H-Pyrazol-5(4H)-one (CAS 137-44-0) is a high-purity pharmaceutical standards reference standard from CATO, an ISO 17034 accredited reference material producer. Molecular formula: C3H4N2O. Molecular weight: 84.08 g/mol. Each batch is supplied with a Certificate of Analysis (COA).
Physical & Chemical Properties
| Molecular Formula | C3H4N2O |
| Molecular Weight | 84.08 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 2 |
Related H Standards
Recommended Standards
- 2H-1,2,3-Triazol-2-amine (CAS 123312-76-5)
- 1,2-Dihydro-3H-pyrazol-3-one (CAS 137-45-1)
- 4-Aminooxazole (CAS 110926-01-7)
- tert-Butyl 7-chloro-3H-spiro[furo[2,3-c]pyridine-2,4'-piperidine]-1'-carboxylate (CAS 2771352-45-3)
- (1S,2S)-Methyl 1-amino-2-ethylcyclopropanecarboxylate (CAS 138457-97-3)
- 3-(Chloromethyl)quinuclidin-3-ol hydrochloride (CAS 247195-81-9)
- (S)-3-((tert-Butoxycarbonyl)amino)-4-(3-cyanophenyl)butanoic acid (CAS 270065-86-6)
- 5-Butoxy-2-fluorophenol (CAS 1881292-99-4)
- 3-(thiophen-2-yl)-4,5-dihydro-1,2,4-oxadiazol-5-one (CAS 35637-09-3)
- SAMS Peptide (CAS 125911-68-4)
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 13829788188 / jacky.chen@cato-chem.com