5-Chloro-1-ethyl-1H-pyrazole CAS 1427020-01-6
| CAS No. | 1427020-01-6 |
| Molecular Formula | C5H7ClN2 |
| Molecular Weight | 130.58 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 5-Chloro-1-ethyl-1H-pyrazole.
5-Chloro-1-ethyl-1H-pyrazole (CAS 1427020-01-6), molecular formula C5H7ClN2 and molecular weight 130.58 g/mol, is a CATO reference standard with documented purity and traceability.
5-Chloro-1-ethyl-1H-pyrazole (C5H7ClN2) contains a nitrile group, chlorine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C5H7ClN2 |
| Molecular Weight | 130.58 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.) | 1991 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 2-Chloro-4,5-dimethyl-1h-imidazole (CAS 1049126-78-4)
- 4-Chloro-1-ethyl-1H-pyrazole (CAS 1171076-88-2)
- 5-Chloro-1,4-dimethyl-1H-pyrazole (CAS 127842-11-9)
- 4-Chloro-1,3-dimethyl-1H-pyrazole (CAS 15878-44-1)
- 4-Chloro-3,5-dimethyl-1H-pyrazole (CAS 15953-73-8)
- 4-Chloro-2,5-dimethyl-1H-imidazole (CAS 16265-08-0)
- 5-Chloro-1,4-dimethyl-1H-imidazole (CAS 1856095-84-5)
- 2-Chloro-1-ethyl-1H-imidazole (CAS 946061-13-8)
Recommended Standards
- 2-(3-Chloroazetidin-3-yl)acetonitrile (CAS 1379377-27-1)
- 4-(2-Chloroethyl)-1H-imidazole (CAS 13518-55-3)
- 2-(2-Chloroethyl)-1H-imidazole (CAS 1341963-55-0)
- 5-(1-Chloroethyl)-1H-imidazole (CAS 127171-35-1)
- 3-Iodo-3-methylbenzophenone (CAS 951887-36-8)
- 1-(4-Aminophenyl)-3,4-dimethyl-1H-pyrazol-5(4H)-one (CAS 29458-30-8)
- 3-(4,5-Dichloro-3-methyl-1h-pyrazol-1-yl)propanenitrile (CAS 1001500-81-7)
- CAS 2300155-89-7 (CAS 2300155-89-7)
- N2,N2-diisobutyl-1,3,4-thiadiazole-2,5-diamine (CAS 897769-65-2)
- QUINDOLINE (CAS 243-58-3)
- 5-Amino-2-fluorobenzyl bromide (CAS 518057-73-3)
- 3-Amino-1,4-dimethyl-1,4,5,7-tetrahydro-6h-pyrazolo[3,4-b]pyridin-6-one (CAS 1105190-81-5)
- H-Cys(farnesyl)-Val-Ile-Ser-OH (CAS 287918-93-8)
- Casein Kinase II Receptor Peptide (CAS 198481-81-1)
Why CATO?
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