1H-Pyrazole-4-carbonyl chloride CAS 103286-53-9
| CAS No. | 103286-53-9 |
| Molecular Formula | C4H3ClN2O |
| Molecular Weight | 130.53 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.
CATO supplies 1H-Pyrazole-4-carbonyl chloride (CAS 103286-53-9), a certified reference material (molecular formula C4H3ClN2O, MW 130.53 g/mol) for analytical method development and quality control.
Owing to an amide group, a hydroxyl group, an ether linkage, chlorine substitution, 1H-Pyrazole-4-carbonyl chloride is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 130.53 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).
As a certified reference material (CRM), 1H-Pyrazole-4-carbonyl chloride 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 | C4H3ClN2O |
| Molecular Weight | 130.53 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, 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 |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1986 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related H Standards
- 1H-Pyrazole-3-carbonyl chloride (CAS 717871-84-6)
- Pyrazole-1-carbonyl Chloride (CAS 53355-55-8)
- (1H-Pyrazole-3,5-diyl)dimethanol (CAS 142179-08-6)
- 1h-Pyrazole-4-carbothioamide (CAS 1017781-31-5)
- 1H-Pyrazole-5-carbothioamide (CAS 1314902-85-6)
- 1H-Pyrazole-1-carbothioamide (CAS 1794-34-9)
- 1H-Pyrazole-4-carbohydrazide (CAS 87551-45-9)
- 1H-Pyrazole-5-carbohydrazide (CAS 26275-64-9)
Recommended Standards
- 3-Chlorofuran-2-carbaldehyde (CAS 101724-23-6)
- 5-Chloro-1H-imidazole-2-carbaldehyde (CAS 1219944-80-5)
- 2-(Chloromethoxy)-1,1-difluoroethane (CAS 1558385-27-5)
- 4-Chloropyrimidin-5-ol (CAS 1261536-41-7)
- 5-Hydroxy-2-naphthoic acid (CAS 2437-18-5)
- 5,6-Dichloro-1-methyl-1,3-dihydro-2H-benzo[d]imidazol-2-one (CAS 1332624-58-4)
- (7-Bromo-2,6-dimethyl-4-oxoquinazolin-3(4H)-yl)methyl pivalate (CAS 140373-65-5)
- 2-[3-Chloro-5-(trifluoromethyl)pyridin-2-yl]-2-(2-fluorophenyl)-2-(morpholin-4-yl)acetonitrile (CAS 339097-07-3)
- 4-Methoxy-2-methylbenzene-1-sulfonamide (CAS 59554-42-6)
- 1-(4-(Tert-butyl)benzyl)-5,6-dichloro-2-(2-chloropyridin-3-yl)-1H-benzo[d]imidazole (CAS 338774-32-6)
- 2-[2-(4-Fluorophenyl)-1,3-thiazol-4-yl]ethan-1-amine dihydrochloride (CAS 1423029-27-9)
- Ethyl 6-sulfamoylpyridine-3-carboxylate (CAS 1251279-39-6)
- rac trans-3-Amino-1-oxyl-2,2,5,5-tetramethylpyrrolidine-4-carboxylic Acid (CAS 15871-58-6)
- Semaglutide impurity 214 (CAS CATO-C4X-2226214)
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