4-Chloro-5-hydroxypyridazin-3(2H)-one CAS 64178-58-1
| CAS No. | 64178-58-1 |
| Molecular Formula | C4H3ClN2O2 |
| Molecular Weight | 146.53 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.
4-Chloro-5-hydroxypyridazin-3(2H)-one (CAS 64178-58-1), molecular formula C4H3ClN2O2 and molecular weight 146.53 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Chloro-5-hydroxypyridazin-3(2H)-one (C4H3ClN2O2) contains an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 146.53 g/mol, it falls into the low-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
As a certified reference material (CRM), 4-Chloro-5-hydroxypyridazin-3(2H)-one 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 | C4H3ClN2O2 |
| Molecular Weight | 146.53 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1975 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 5-Chloro-1H-pyrazole-4-carboxylic acid (CAS 1186049-67-1)
- 6-Chloro-4-hydroxypyridazin-3(2H)-one (CAS 17276-75-4)
- 2-Chloro-1-(1,2,5-oxadiazol-3-yl)ethanone (CAS 1803581-79-4)
- 2-Chloro-1H-imidazole-4-carboxylic Acid (CAS 944905-33-3)
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- 3-Chloro-4-methylfuran-2,5-dione (CAS 57547-55-4)
- 4-Chloro-1,2-dihydropyridazine-3,6-dione (CAS 5397-64-8)
Recommended Standards
- 4-Chloropyrazole-3-carboxylic Acid (CAS 84547-87-5)
- 3-chlorofuran-2-carboxylic acid (CAS 66204-31-7)
- 5-Chloro-1H-imidazole-4-carboxylic acid (CAS 76808-73-6)
- 5-Chloro-6-hydroxypyrimidin-4(5H)-one (CAS 63447-41-6)
- Z-Glu(OtBu)-OH.DCHA (CAS 3967-21-3)
- 3-chloro-1,2-dihydropyrazin-2-one (CAS 105985-17-9)
- Ethyl 4-amino-1-benzylpiperidine-4-carboxylate (CAS 57611-55-9)
- 2,6-Dichloro-9-phenyl-9H-purine (CAS 6971-26-2)
- 2,4-Dichloro-6-fluoro-3-nitrobenzoic acid (CAS 1823915-31-6)
- 4-methyl-5-phenyl-3-(piperidin-1-ylcarbonyl)thien-2-ylamine (CAS 782462-76-4)
- 1-(3,5-Difluorophenyl)heptan-1-one (CAS 1250647-44-9)
- 3-ethoxyazetidine-3-carboxylic acid hydrochloride (CAS 1523618-24-7)
- H-D-Leu-pNA (CAS 63324-49-2)
- Allo-Thr5-Tirzepatide (CAS CATO-CPTD788934)
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