3-(2,5-Dichlorothiophen-3-yl)-1H-pyrazole CAS 166196-62-9
| CAS No. | 166196-62-9 |
| Molecular Formula | C7H4Cl2N2S |
| Molecular Weight | 219.09 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a nitrile group, sulfur-containing functionality, chlorine substitution, an aromatic ring system, 3-(2,5-Dichlorothiophen-3-yl)-1H-pyrazole is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 219.09 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
3-(2,5-Dichlorothiophen-3-yl)-1H-pyrazole (CAS 166196-62-9) is a high-purity analytical reference standard with the molecular formula C7H4Cl2N2S and a molecular weight of 219.09 g/mol.
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.
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 | C7H4Cl2N2S |
| Molecular Weight | 219.09 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2004 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Dichlorothiophen Standards
- 4-(2,5-Dichlorothiophen-3-yl)butan-1-amine (CAS 1483263-48-4)
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- 2-(4,5-Dichlorothiophen-2-yl)acetic acid (CAS 89281-28-7)
- 2-(2,5-Dichlorothiophen-3-yl)acetamide (CAS 34967-62-9)
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Recommended Standards
- 4,6-Dichlorobenzo[d]thiazol-2-amine (CAS 16582-59-5)
- 4,7-Dichloro-2-methylthieno[3,2-d]pyrimidine (CAS 1823921-18-1)
- 5,7-Dichlorobenzo[d]thiazol-2-amine (CAS 158465-13-5)
- 4,7-Dichloro-1,3-benzothiazol-2-amine (CAS 1849-70-3)
- VAL-083 (CAS 23261-20-3)
- 2,4-Dibromo-3-fluoroaniline (CAS 1253889-53-0)
- n-Cyclopropyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzenesulfonamide (CAS 914610-50-7)
- 2-(Hydrazinecarbonyl)benzenesulfonamide (CAS 102169-52-8)
- 4-Bromo-3-(difluoromethyl)-6-fluoropyridin-2-amine (CAS 1805167-07-0)
- 5-(2,4-dimethylphenyl)-4H-1,2,4-triazol-3-amine (CAS 502685-90-7)
- 2-(5-Bromothiazol-2-yl)propan-2-amine (CAS 1368049-77-7)
- Dotinurad Impurity 24 (CAS 4433-53-8)
- 2-Amino-1-[3,4-dihydro-2(1H)-isoquinolinyl]-2-methyl-1-propanone hydrochloride (CAS 1220033-50-0)
- 3AEEA-Semaglutide(Endo-AEEA-Semaglutide) (CAS CATO-C4X-2226265)
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