1-(2-Chloro-4-nitrophenyl)-3,5-dimethyl-1H-pyrazole CAS 103862-71-1
| CAS No. | 103862-71-1 |
| Molecular Formula | C11H10ClN3O2 |
| Molecular Weight | 251.67 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 1-(2-Chloro-4-nitrophenyl)-3,5-dimethyl-1H-pyrazole (CAS 103862-71-1), a certified reference material (molecular formula C11H10ClN3O2, MW 251.67 g/mol) for analytical method development and quality control.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, 1-(2-Chloro-4-nitrophenyl)-3,5-dimethyl-1H-pyrazole is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 251.67 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.
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 | C11H10ClN3O2 |
| Molecular Weight | 251.67 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related Chloro Standards
- 4-Chloro-1-(4-methylbenzyl)-3-nitro-1H-pyrazole (CAS 1005577-45-6)
- Methyl 3-chloro-5-cyclopropylpyrazolo[1,5-a]pyrimidine-7-carboxylate (CAS 1018053-16-1)
- Methyl 7-chloro-4-hydroxy-8-methylquinoline-2-carboxylate (CAS 1065074-49-8)
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Recommended Standards
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- 5-(7-(Dibenzo[b,d]furan-3-yloxy)heptyl)-3-methylisoxazole (CAS 126311-40-8)
- (2-Fluoro-4-((1s,4r)-4-propylcyclohexyl)phenyl)boronic acid (CAS 159119-10-5)
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