4-Chloro-1,3-dimethyl-1H-pyrazole-5-carbonyl chloride CAS 128141-47-9
| CAS No. | 128141-47-9 |
| Molecular Formula | C6H6Cl2N2O |
| Molecular Weight | 193.03 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 4-Chloro-1,3-dimethyl-1H-pyrazole-5-carbonyl chloride (C6H6Cl2N2O) contains an amide group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 193.03 g/mol, it falls into the medium-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
4-Chloro-1,3-dimethyl-1H-pyrazole-5-carbonyl chloride (CAS 128141-47-9) is a high-purity analytical reference standard with the molecular formula C6H6Cl2N2O and a molecular weight of 193.03 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 | C6H6Cl2N2O |
| Molecular Weight | 193.03 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1993 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 2-(4-Chloro-3-methyl-1H-pyrazol-1-yl)acetyl chloride (CAS 1002534-97-5)
- 4-Chloro-2-(chloromethyl)-6-methoxypyrimidine (CAS 1056897-78-9)
- 4-chloro-6-(1-chloroethyl)-1,3,5-triazin-2-amine (CAS 1139245-20-7)
- 4-Chloro-1-ethyl-1H-pyrazole-5-carbonyl chloride (CAS 1171932-05-0)
- 4-Chloro-1-ethyl-1H-pyrazole-3-carbonyl chloride (CAS 1172515-44-4)
- 2-(4-Chloro-1H-pyrazol-1-yl)propanoyl chloride (CAS 1217862-81-1)
- 4-Chloro-1,5-dimethyl-1H-pyrazole-3-carbonyl chloride (CAS 189224-46-2)
- 4-Chloro-3,5-dimethyl-1H-pyrazole-1-carbonyl chloride (CAS 67514-73-2)
Recommended Standards
- 4,5-Dichloro-6-methoxy-2-methylpyrimidine (CAS 126804-42-0)
- 1-(2,4-Dichloropyrimidin-5-yl)ethan-1-ol (CAS 130825-17-1)
- 3,5-Dichloro-4-methoxypyridin-2-amine (CAS 1261269-31-1)
- 3,5-Dichloro-2-(hydroxymethyl)phenol (CAS 1314922-16-1)
- Ethyl 2-(3-cyclopropyl-4-(difluoromethyl)-6-(furan-2-yl)-1H-pyrazolo[3,4-b]pyridin-1-yl)acetate (CAS 1018050-88-8)
- Mal-amido-PEG24-TFP ester (CAS 2384191-62-0)
- Sar-OBzl · p-tosylate (CAS 54384-06-4)
- 5-Hydroxy-1,2-dimethylpyridin-1-ium iodide (CAS 59344-35-3)
- 1,2-Dimethyl-3-(alpha,alpha,alpha-Trifluoro-m-Tolyl)Pyrrolidin-3-Ol Propionate (CAS 69552-08-5)
- 6,6'-Methylenebis(4-chloro-2-isopropyl-5-methylphenol) (CAS 15686-33-6)
- 28-Norlup-16(17)-ene (CAS 53767-47-8)
- 5-(2-Fluoroethoxy)nicotinic acid (CAS 1512576-53-2)
- {[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]methyl}(triphenyl)phosphonium chloride (CAS 1029631-97-7)
- D-[Phe]6-Semaglutide (CAS CATO-CPTD788633)
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