4-(Chloromethyl)-1-ethyl-1H-pyrazole CAS 405103-61-9
| CAS No. | 405103-61-9 |
| Molecular Formula | C6H9ClN2 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-(Chloromethyl)-1-ethyl-1H-pyrazole (CAS 405103-61-9) is a high-purity analytical reference standard with the molecular formula C6H9ClN2HCl and a molecular weight of 181.06 g/mol.
Owing to a nitrile group, chlorine substitution, 4-(Chloromethyl)-1-ethyl-1H-pyrazole is typically white to off-white crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 181.06 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C6H9ClN2 HCl |
| Molecular Weight | 181.06 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 | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 2.0 |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
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- N-(2-(5-(4-Ethoxyphenyl)-1-isobutyryl-4,5-dihydro-1H-pyrazol-3-yl)phenyl)methanesulfonamide (CAS 923250-49-1)
- 4-[3-(N,N-Dimethylamino)phenyl]-4-oxobutyric acid (CAS 951888-95-2)
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