4-chloro-1-methyl-5-nitro-1H-pyrazole CAS 84547-95-5
| CAS No. | 84547-95-5 |
| Molecular Formula | C4H4ClN3O2 |
| Molecular Weight | 161.55 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 161.55 g/mol gives 4-chloro-1-methyl-5-nitro-1H-pyrazole distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4-chloro-1-methyl-5-nitro-1H-pyrazole (CAS 84547-95-5), molecular formula C4H4ClN3O2 and molecular weight 161.55 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C4H4ClN3O2, 4-chloro-1-methyl-5-nitro-1H-pyrazole contains an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 161.55 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.
As a certified reference material (CRM), 4-chloro-1-methyl-5-nitro-1H-pyrazole 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 | C4H4ClN3O2 |
| Molecular Weight | 161.55 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| 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.) | 1981 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related chloro Standards
- 1428577-87-0 5-Chloro-1-(~2~H_3_)methyl-4-nitro-1H-pyrazole DTXSID40857353 (CAS 1428577-87-0)
- 2-Chloro-1-methyl-4-nitro-1H-imidazole (CAS 63634-21-9)
- 2-Chloro-1-methyl-5-nitro-1H-imidazole (CAS 86072-07-3)
- 2-chloro-N-(1H-1,2,3,4-tetrazol-5-yl)acetamide (CAS 6158-78-7)
- 3-Chloro-1-methyl-4-nitro-1H-pyrazole (CAS 299930-70-4)
- 4-Chloro-1-methyl-2-nitro-1H-imidazole (CAS 63634-20-8)
- 4-Chloro-2-methyl-5-nitro-1H-imidazole (CAS 63662-67-9)
- 4-Chloro-3-methyl-5-nitro-1H-pyrazole (CAS 400753-12-0)
Recommended Standards
- 3-(Chloromethyl)-1,2,4-oxadiazole-5-carboxamide (CAS 25977-21-3)
- 4-Chloro-5-methyl-3-nitro-1H-pyrazole (CAS 512810-26-3)
- 5-(Chloromethyl)-1,2,4-oxadiazole-3-carboxamide (CAS 34879-29-3)
- 5-Amino-4-chloro-1H-pyrazole-3-carboxylic acid (CAS 351990-69-7)
- Isopentylhydrazine Dihydrochloride (CAS 1355355-69-9)
- 3-Formylphenyl cyclopropanecarboxylate (CAS 590357-04-3)
- Methyl 7-bromo-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylate (CAS 942152-80-9)
- 4-Methoxy-3-[(4-methylphenyl)sulfamoyl]benzoic acid (CAS 431883-78-2)
- 3-amino-1-[4-(trifluoromethyl)phenyl]pyrrolidin-2-one hydrochloride (CAS 2044712-54-9)
- Methyl 5-picolinoyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine-4-carboxylate (CAS 1421449-64-0)
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