4-Chloro-5-ethyl-1H-pyrazol-3-amine CAS 110580-33-1
| CAS No. | 110580-33-1 |
| Molecular Formula | C5H8ClN3 |
| Molecular Weight | 145.59 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 145.59 g/mol gives 4-Chloro-5-ethyl-1H-pyrazol-3-amine distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4-Chloro-5-ethyl-1H-pyrazol-3-amine (CAS 110580-33-1), molecular formula C5H8ClN3 and molecular weight 145.59 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 4-Chloro-5-ethyl-1H-pyrazol-3-amine (C5H8ClN3) is characterized by a nitrile group, chlorine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
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 | C5H8ClN3 |
| Molecular Weight | 145.59 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1988 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related Chloro Standards
- (4-Chloro-1-methyl-1h-pyrazol-5-yl)methanamine (CAS 1001500-75-9)
- 4-Chloro-1,5-dimethyl-1h-pyrazol-3-amine (CAS 1006320-25-7)
- 4-Chloro-1-ethyl-1,2-dihydro-3h-pyrazol-3-imine (CAS 1006333-30-7)
- 4-Chloro-1,3-dimethyl-1H-pyrazol-5-amine (CAS 1006481-77-1)
- 2-chloro-N-(prop-2-yn-1-yl)propanamide (CAS 1016727-29-9)
- (4-Chloro-1-methyl-1h-pyrazol-3-yl)methanamine (CAS 1017785-44-2)
- 2-Chloro-5-isopropyloxazole (CAS 1060816-24-1)
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Recommended Standards
- 4-chloro-2-methyl-pyrazole-3-carbonitrile (CAS 1172024-69-9)
- 5-(Chloromethyl)-2-ethyl-1,3-oxazole (CAS 1206977-45-8)
- 3-(Chloromethyl)-5-ethylisoxazole (CAS 122221-01-6)
- 4-(chloromethyl)-1-ethyl-1H-1,2,3-triazole (CAS 1250619-23-8)
- L-arginine7-amido-4-methylcoumarindihydrochloride (CAS 113712-08-6)
- 2-(3,5-Dimethylphenoxy)-5-(trifluoromethyl)benzonitrile (CAS 477867-14-4)
- 550379-21-0 5-Nitrothiophene-2-ol DTXSID10609503 (CAS 550379-21-0)
- N-benzyl-2-(trifluoromethyl)aniline (CAS 852635-14-4)
- 2-(oxiran-2-yl)acetic acid (CAS 33278-09-0)
- 3,4-Bis(benzyloxy)-5-methoxybenzoic acid (CAS 70845-73-7)
- 4'-Bromo-[1,1'-biphenyl]-2-ol (CAS 21849-89-8)
- 3-Chloro-4-(trifluoromethylthio)aniline 3-chloro-4-trifluoromethylsulfanyl-phenylamine 3-chloro-4-trifluoromethylthioaniline 64628-74-6 (CAS 64628-74-6)
- (5-Cyclopropylisoxazol-4-yl)methanol (CAS 1896506-45-8)
- DAPK Substrate Peptide (CAS 386769-53-5)
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