1,2-Dihydro-3H-pyrazol-3-one CAS 137-45-1
| CAS No. | 137-45-1 |
| Molecular Formula | C3H4N2O |
| Molecular Weight | 84.08 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 1,2-Dihydro-3H-pyrazol-3-one is closely related to an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
1,2-Dihydro-3H-pyrazol-3-one (CAS 137-45-1) is a high-purity analytical reference standard with the molecular formula C3H4N2O and a molecular weight of 84.08 g/mol.
Owing to an amide group, a hydroxyl group, an ether linkage, 1,2-Dihydro-3H-pyrazol-3-one is typically white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 84.08 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO manufactures 1,2-Dihydro-3H-pyrazol-3-one under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
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 Dihydro Standards
- 2,4-Dihydro-3H-1,2,4-triazol-3-imine (CAS 65380-04-3)
- 2,3-Dihydro-5-methylfuran (CAS 1487-15-6)
- 5-Methyl-4,5-dihydro-1H-pyrazole (CAS 1568-20-3)
- 2,3-Dihydro-2-methylfuran (CAS 1708-25-4)
- 2,5-Dihydro-2-methylfuran (CAS 1708-30-1)
- 1911-30-4 3-Methyl-4,5-dihydro-1H-pyrazole DTXSID80339724 (CAS 1911-30-4)
- 3,6-Dihydro-2H-pyran (CAS 3174-74-1)
- 3,4-Dihydro-2H-Pyran (CAS 110-87-2)
Recommended Standards
- 1H-Pyrazol-5(4H)-one (CAS 137-44-0)
- 3H-Pyrazol-5-ol (CAS 145091-84-5)
- 2H-1,2,3-Triazol-2-amine (CAS 123312-76-5)
- 4H-Pyrazol-3-ol (CAS 145091-85-6)
- 4-Chloro-8-iodo-3-nitroquinoline (CAS 1596824-22-4)
- 3-Fluoro-2,2-dimethylpropan-1-ol (CAS 883444-33-5)
- 2-(2,4-Dimethoxybenzylidene)benzo[4,5]imidazo[2,1-b]thiazol-3(2H)-one (CAS 299949-71-6)
- Butan-2-one oxime compound with methoxy(2-(methylsilyl)-2lambda5-butan-2-ylidene)azane (1:1) (CAS 37843-26-8)
- Decitabine Impurity 45 (CAS CATO-C4X-113745)
- 3-Amino-4-chloropicolinaldehyde (CAS 1289045-73-3)
- 6-(3,4-Difluorophenoxy)hexanenitrile (CAS 1443345-01-4)
- 5-Hydroxymethyl-2'-deoxyuridine (CAS 5116-24-5)
- 4-Chloro-1-(4-methoxy-benzyl)-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid amide (CAS 2355385-19-0)
- Semaglutide impurity 70 (CAS CATO-C4X-222670)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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