1,3-Dimethyl-4-nitro-1H-pyrazole CAS 3920-38-5
| CAS No. | 3920-38-5 |
| Molecular Formula | C5H7N3O2 |
| Molecular Weight | 141.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 1,3-Dimethyl-4-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.
1,3-Dimethyl-4-nitro-1H-pyrazole (CAS 3920-38-5) is a high-purity analytical reference standard with the molecular formula C5H7N3O2 and a molecular weight of 141.13 g/mol.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 1,3-Dimethyl-4-nitro-1H-pyrazole is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 141.13 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).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
Physical & Chemical Properties
| Molecular Formula | C5H7N3O2 |
| Molecular Weight | 141.13 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 3 |
Related Dimethyl Standards
- 1,3-Dimethyl-1H-1,2,4-triazole-5-carboxylic acid (CAS 1023307-69-8)
- 1,3-Dimethyl-5-nitro-1h-pyrazole (CAS 1170783-25-1)
- 1,2-Dimethyl-4-nitro-1H-imidazole (CAS 13230-04-1)
- 4,5-Dimethyl-4H-1,2,4-triazole-3-carboxylic acid (CAS 1393540-04-9)
- 1,5-Dimethyl-1H-1,2,4-triazole-3-carboxylic acid (CAS 1393540-58-3)
- 3,5-Dimethyl-4-nitropyrazole (CAS 14531-55-6)
- 1,4-Dimethyl-3-nitro-1H-pyrazole (CAS 26956-09-2)
- 1,4-Dimethyl-5-nitro-1H-pyrazole (CAS 70951-89-2)
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- 2,4-Dibromo-5-(difluoromethyl)pyridine (CAS 1804934-19-7)
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- tert-butyl (2S)-2-(aminomethyl)-1H,2H,3H-pyrrolo[3,2-c]pyridine-1-carboxylate (CAS 2803420-64-4)
- 1-(sec-Butyl)-5-methyl-1H-pyrazole (CAS 1171392-51-0)
- N-[(9-Ethyl-9H-carbazol-3-yl)methyl]-1-methoxypropan-2-amine (CAS 418779-31-4)
- 3-Iodo-1H-pyrrolo[3,2-b]pyridin-6-ol (CAS 1190316-99-4)
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